Beyond the Brave

4 monsters
This card's name becomes "Umi" while on the field. If this card is Link Summoned: You can Special Summon up to 3 monsters that mention "Atlantis, City of the Sea Dragon" from your GY to your zone this card points to, also you cannot Special Summon for the rest of this turn. Once per turn (Quick Effect): You can send 1 face-up "Umi" you control to the GY; send all cards on the field to the GY, except "Umi".

Azure Ocean Dragon Lord - Neo-Daedalus Rage

While you control "Umi", your opponent cannot target WATER Link Monsters you control with card effects. If this card is added to your hand, except by drawing it: You can reveal this card and 1 WATER monster in your hand; Special Summon both, also you cannot Special Summon for the rest of this turn, except WATER monsters. You can only use this effect of "Coralianectes, the Luminous Cradle Dragon" once per turn.

Coralianectes, the Luminous Cradle Dragon

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Levia-Dragon of Atlantis - Daedalus" once per turn. If you control "Atlantis, City of the Sea Dragon" or "Umi": You can Special Summon this card from your hand. You can send up to 3 face-up "Umi" you control to the GY; add that many cards that mention "Atlantis, City of the Sea Dragon" from your Deck to your hand, except Level 7 monsters, then you can send 1 card on the field to the GY.

Levia-Dragon of Atlantis - Daedalus

3 WATER monsters
This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Levia-Dragoon - Daedalus" once per turn. If this card is Link Summoned: You can Special Summon 1 monster that mentions "Atlantis, City of the Sea Dragon" from your Deck. During the Main Phase (Quick Effect): You can send 1 face-up "Umi" you control to the GY; discard your opponent's entire hand, and if you do, they draw the same number of cards. Neither player can activate cards or effects in response to this effect's activation.

Levia-Dragoon - Daedalus

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Monster Arms of Atlantis" once per turn. If this card is Normal or Special Summoned: You can target 1 monster that mentions "Atlantis, City of the Sea Dragon" in your GY; Special Summon it in Defense Position. When your opponent activates a monster effect (Quick Effect): You can banish this card from your field or GY, and send 1 face-up "Umi" you control to the GY; negate that activated effect.

Monster Arms of Atlantis

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Siren Vortex of Atlantis" once per turn. If this card is Normal or Special Summoned: You can send 1 card that mentions "Atlantis, City of the Sea Dragon" from your Deck to the GY, except "Siren Vortex of Atlantis". If this card is sent to the GY and you control "Umi": You can Special Summon 1 WATER monster from your hand.

Siren Vortex of Atlantis

This card's name becomes "Umi" while on the field. You can only use each of the following effects of "Warchief of Atlantis" once per turn. You can discard this card; add 1 Spell/Trap that mentions "Atlantis, City of the Sea Dragon" from your Deck to your hand. If you control "Umi" and this card is in your GY: You can Special Summon this card.

Warchief of Atlantis

Magnificent Monsters

2 monsters with different Types
If this card is Link Summoned: You can Set 1 Spell/Trap "Fur Hire" or 1 "Fandora, the Flying Furtress" from your Deck, also you cannot Special Summon for the rest of this turn, except monsters "Fur Hire". During your opponent's turn (Quick Effect): You can banish this card from your GY, and if you do, Special Summon 1 monster "Fur Hire" from your hand, then if your opponent controls a monster with the highest original ATK on the field (even if tied), you can Special Summon 1 more such monster. You can only use each effect of "Keel, Shipwright Fur Hire" once per turn.

Keel, Shipwright Fur Hire

You can banish 1 other "P.U.N.K." card from your hand or GY; Special Summon this card from your hand. If this card is Special Summoned: You can pay 600 LP; add to your hand, or Special Summon, 1 "P.U.N.K." monster from your Deck or GY, except a Level 8 monster. When a monster your opponent controls with 2500 or more ATK activates its effect (Quick Effect): You can change it to face-down Defense Position. You can only use each effect of "Noh-P.U.N.K. Rising Scale" once per turn.

Noh-P.U.N.K. Rising Scale

While you control a monster, except "Poseidra, the Storming Atlantean", your opponent's monsters cannot target this card for attacks. You can only use each of the following effects of "Poseidra, the Storming Atlantean" once per turn. You can send 1 other WATER monster from your hand or face-up field to the GY; Special Summon this card from your hand. If this card is Normal or Special Summoned: You can send 1 "Atlantean" or "Mermail" monster from your Deck to the GY, then target 1 card your opponent controls; return it to the hand.

Poseidra, the Storming Atlantean

Chaos Origins

''A draco-horse racing around freely upon the boiling sea. It continues to run on the water surface today in order to prevent its own flames from extinguishing. It dreams of one day setting foot upon its homeland.''

Ignihorse Dragonis

1 "Aleister" monster + 1 DARK or WATER monster
While this card is in the Main Monster Zone, your opponent's monsters cannot target monsters for attacks, except this one. While this card is in the Extra Monster Zone, any monster sent to your opponent's GY is banished instead. You can banish this card from your GY, then target 1 Fusion Monster you control; it can attack directly this turn. You can only use this effect of "Invoked Oceanus" once per turn.

Invoked Oceanus

Ultimate Tournament Pack 1

When this card is Normal Summoned: You can Special Summon 1 Level 3 or lower Sea Serpent monster from your Deck.

Deep Sea Diva

Maze of Muertos

(This card is always treated as "Water Dragon".)
You can banish this card you control; Special Summon 3 Level 5 or lower Dinosaur monsters (WATER or WIND) from your Deck in Defense Position (but their effects are negated), also you cannot Special Summon from the Extra Deck for the rest of this turn, except Dinosaur or Sea Serpent monsters. You can only use this effect of "Light Water Dragon" once per turn.

Light Water Dragon

3 Level 4 monsters
Once per turn, when this attacking card destroys an opponent's monster by battle and sends it to the GY: You can detach 1 material from this card; Special Summon the destroyed monster to your opponent's field in Attack Position (but it loses 1000 ATK), and if you do, this card can make a second attack during this Battle Phase.

Number 32: Shark Drake

2025 Mega-Pack Tin

2 Level 3 monsters
If this card is Special Summoned: You can add 1 "Virtue Stream" from your Deck to your hand. You can activate 1 of these effects;
● Detach 1 material from a monster you control, then add 1 Fish, Sea Serpent, or Aqua monster from your GY to your hand, except "LeVirtue Dragon".
● Target 2 Xyz Monsters on the field; attach 1 material from 1 of those monsters to the other.
You can only use each effect of "LeVirtue Dragon" once per turn.

LeVirtue Dragon

2+ monsters, including a Fish, Sea Serpent, or Aqua monster
Your opponent cannot target WATER monsters this card points to with card effects. You can only use each of the following effects of "Mermail King - Neptabyss" once per turn. If a WATER monster(s) is sent to the GY to activate a card or effect (except during the Damage Step): You can take 1 "Abyss-" Equip Spell from your Deck or GY and either add it to your hand or equip it to this card. If this card in its owner's possession is destroyed by an opponent's card: You can add 1 "Atlantean" or "Mermail" monster from your Deck to your hand.

Mermail King - Neptabyss

(This card is always treated as an "Atlantean" card.)
You can discard 1 card to the GY; WATER monsters you currently control become Level 7 until the end of this turn. If this card is sent to the GY to activate a WATER monster's effect: Special Summon 1 Level 4 or lower "Atlantean" or "Mermail" monster from your Deck, except "Mermail Shadow Squad", also you cannot Special Summon from the Extra Deck for the rest of this turn, except WATER monsters. You can only use each effect of "Mermail Shadow Squad" once per turn.

Mermail Shadow Squad

4 Level 5 monsters
You can also Xyz Summon this card by discarding 1 Spell, and using a Rank 4 "Shark Drake" Xyz Monster you control as material. (Transfer its materials to this card.) Once per turn (Quick Effect): You can detach 1 material from this card, then target 1 Effect Monster your opponent controls; negate its effects, and if you do, its ATK/DEF become 0. This card can make a second attack during each Battle Phase, also if it attacks a Defense Position monster, inflict piercing battle damage to your opponent.

Number C32: Shark Drake LeVeiss

3 Level 7 monsters
Once per turn, you can also Xyz Summon "Poseidra Abyss, the Atlantean Dragon Lord" by using 1 "Atlantean" or "Mermail" Xyz Monster you control. (Transfer its materials to this card.) Once per turn: You can detach 2 materials from this card, then send 1 WATER monster from your hand or Deck to the GY; return up to 3 cards your opponent controls to the hand. If this Xyz Summoned card is sent to the GY: You can discard 1 card to the GY; Special Summon 3 Level 3 or lower Fish, Sea Serpent, and/or Aqua monsters from your hand and/or GY.

Poseidra Abyss, the Atlantean Dragon Lord

Battles of Legend: Monster Mayhem

3 Level 5 WATER monsters
You can also Xyz Summon this card by using "Number 37: Hope Woven Dragon Spider Shark" you control (transfer its materials to this card). Once per turn: You can detach 1 material from this card, then target 1 monster your opponent controls; banish it (until their next Standby Phase), and if you do, any monsters they currently control lose 1000 ATK until the end of this turn. Once per turn, during the End Phase, if this card is in your GY because this Xyz Summoned card was destroyed and sent there this turn: You can Special Summon it.

Number S37: Spider Shark

1 Tuner + 1+ non-Tuner monsters
If this card is Synchro Summoned: You can target cards your opponent controls, up to the number of Level 3 Psychic monsters with different names you control and in your GY; return them to the hand. You can target 1 "P.U.N.K." monster in your GY, except "Ukiyoe-P.U.N.K. Amazing Dragon"; Special Summon it. You can only use 1 "Ukiyoe-P.U.N.K. Amazing Dragon" effect per turn, and only once that turn.

Ukiyoe-P.U.N.K. Amazing Dragon

Quarter Century Stampede

During your Main Phase, you can Normal Summon 1 Level 4 or lower Sea Serpent-Type monster in addition to your Normal Summon/Set. (You can only gain this effect once per turn.) When this card is sent to the Graveyard to activate a WATER monster's effect: Target 1 face-up card your opponent controls; destroy that target.

Atlantean Heavy Infantry

When this card inflicts battle damage to your opponent: You can Special Summon 1 Level 4 or lower "Atlantean" Sea Serpent-Type monster from your Deck, except "Atlantean Marksman". When this card is sent to the Graveyard to activate a WATER monster's effect: Target 1 Set card your opponent controls; destroy that target.

Atlantean Marksman

2 Level 4 monsters
Once per turn: You can detach 1 Xyz Material from this card to activate 1 of these effects;
● Send 1 card from your Deck to the Graveyard.
● Choose 1 monster from your Deck and place it on top of your Deck.

Lavalval Chain

You can discard 2 other WATER monsters to the GY; Special Summon this card from your hand. When Summoned this way: You can add 1 "Abyss-" Spell/Trap from your Deck to your hand. You can Tribute 1 other Attack Position WATER monster; this card can make a second attack during each Battle Phase this turn.

Mermail Abyssmegalo

1+ Effect Monsters
You can only control 1 "Worldsea Dragon Zealantis". You can only use each of the following effects of "Worldsea Dragon Zealantis" once per turn. During your Main Phase: You can banish all monsters on the field, then Special Summon as many monsters as possible that were banished by this effect, to their owners' fields, face-up, or in face-down Defense Position. During the Battle Phase (Quick Effect): You can destroy cards on the field up to the number of co-linked monsters on the field.

Worldsea Dragon Zealantis

Supreme Darkness

2+ Level 7 WATER monsters
WATER monsters you control gain 300 ATK/DEF for each material attached to this card. You can only use each of the following effects of "Abysstrite, the Atlantean Spirit" once per turn. If this card is Xyz Summoned: You can target 1 Level 7 or lower Fish, Sea Serpent, or Aqua monster in your GY; Special Summon it. You can detach 1 material from this card; Set 1 "Abyss-" Trap from your Deck.

Abysstrite, the Atlantean Spirit

If 3 or more Level 10 monsters are in your field, GY, and/or banishment, while this card is in your hand: You can Special Summon this card. If this card is Special Summoned: You can send the top card of your Deck to the GY; this card gains 500 ATK, then if the card sent to the GY was a monster, inflict 1000 damage to your opponent, otherwise, you can send the new top card of your Deck to the GY. You can only use each effect of "Driangle, Dragon of the Dark Deep" once per turn.

Driangle, Dragon of the Dark Deep

Crossover Breakers

2 Level 4 monsters
While this card has a material attached that was originally WATER, all WATER monsters you control gain 500 ATK. Once per turn (Quick Effect): You can detach 1 material from this card; your opponent cannot activate any card effects in their GY this turn.

Abyss Dweller

You can discard this card; add 1 "Ryu-Ge Realm - Sea Spires" from your Deck to your hand. During your Main Phase, if 2 or more monsters were sent from the hand and/or Deck to the GY this turn, except "Kairo Ryu-Ge Emva": You can Special Summon this card from your GY. You can place 1 "Ryu-Ge Realm - Sea Spires" you control on the bottom of the Deck; banish your opponent's entire hand, and if you do, they draw the same number of cards. You can only use each effect of "Kairo Ryu-Ge Emva" once per turn.

Kairo Ryu-Ge Emva

Quarter Century Bonanza

All Level 3 or lower Sea Serpent-Type monsters you control can attack your opponent directly. When this card is sent to the Graveyard to activate a WATER monster's effect: Add 1 Sea Serpent-Type monster from your Deck to your hand, except "Atlantean Dragoons".

Atlantean Dragoons

1 Tuner + 1+ non-Tuner monsters
You can discard any number of cards to the GY, then target the same number of cards your opponent controls; return those cards to the hand. You can only use this effect of "Brionac, Dragon of the Ice Barrier" once per turn.

Brionac, Dragon of the Ice Barrier

You can send 1 "Atlantean" monster from your Deck to the Graveyard, except "Neptabyss, the Atlantean Prince"; add 1 "Atlantean" card from your Deck to your hand, except "Neptabyss, the Atlantean Prince". If this card is sent to the Graveyard to activate a WATER monster's effect: Target 1 "Atlantean" monster in your Graveyard, except "Neptabyss, the Atlantean Prince"; Special Summon it. You can only use each effect of "Neptabyss, the Atlantean Prince" once per turn.

Neptabyss, the Atlantean Prince

25th Anniversary Tin: Dueling Mirrors

2 Level 4 WATER monsters
Once per turn: You can detach 1 material from this card; Special Summon 1 Rank 3 or lower WATER Xyz Monster from your Extra Deck. This card cannot attack for the rest of this turn.

Bahamut Shark

Cannot be used as material for a Fusion, Synchro, or Xyz Summon. Cannot be Tributed while face-up in the Monster Zone. If this card is sent to the GY as material for a Link Summon: Special Summon this card in Defense Position, to the opponent's field of the player that Link Summoned. You can only use this effect of "Click & Echo" twice per turn. While this card, that was Summoned by its effect, is in the Monster Zone, you must keep your hand revealed.

Click & Echo

Battles of Legend: Terminal Revenge

1 Tuner + 1+ non-Tuner monsters
If this card is Synchro Summoned: You can discard 1 card, then target 1 card on the field; return it to the hand. If this card is Special Summoned from the GY: You can discard 1 card, then target 1 card on the field; return it to the hand. You can only use each effect of "Brionac, the Magical Ice Dragon" once per turn.

Brionac, the Magical Ice Dragon

While you control another "Ice Barrier" monster, monsters your opponent controls lose 500 ATK/DEF. During your Main Phase: You can send 1 Level 3 or lower "Ice Barrier" monster from your Deck to the GY, and if you do, this card's Level becomes the same as that monster's, until the end of this turn. You can only use this effect of "Hexa Spirit of the Ice Barrier" once per turn.

Hexa Spirit of the Ice Barrier

25th Anniversary Tin: Dueling Heroes Mega Pack

4 Level 4 WATER monsters
You can also Xyz Summon this card by using a "Number 32: Shark Drake" you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) During either player's turn, if your Life Points are 1000 or less: You can detach 1 Xyz Material from this card and banish 1 monster from your Graveyard to target 1 face-up monster on the field; that target's ATK and DEF become 0 until the End Phase.

Number C32: Shark Drake Veiss

This card on the field can be treated as a Level 8 monster when used for a Synchro Summon. A Synchro Monster that used this card as material gains this effect based on its original Level.
● 8 or lower: Gains 800 ATK/DEF.
● 9 or higher: If this card attacks a Defense Position monster, inflict piercing battle damage.

Yamatako Orochi

Speed Duel: Streets of Battle City

Once per turn: You can banish 1 Fish, Sea Serpent, or Aqua-Type monster from your hand, then target 1 face-up card your opponent controls; destroy that target, then banish this card until your next Standby Phase.

Airorca

Battles of Legend: Crystal Revenge

Cannot be Normal Summoned/Set. Must first be Special Summoned (from your hand) by banishing 1 LIGHT and 1 DARK monster from your GY. While a Field Spell is face-up on the field, your opponent cannot target LIGHT or DARK monsters you control with card effects. You can target cards on the field, up to the number of face-up Field Spells on the field; banish them. You can only use this effect of "Chaos Daedalus" once per turn.

Chaos Daedalus

Speed Duel GX: Midterm Paradox

This card can be treated as 2 Tributes for the Tribute Summon of a LIGHT monster.

Kaiser Sea Horse

Cannot be Normal Summoned/Set. Must be Special Summoned with "Bonding - H2O". The ATK of FIRE monsters and Pyro monsters on the field becomes 0. When this card is destroyed and sent to the GY: You can target 2 "Hydrogeddon" and 1 "Oxygeddon" in your GY; Special Summon them.

Water Dragon

Cannot be Normal Summoned/Set. Must be Special Summoned with the effect of a "Bonding" Spell/Trap. If this card is Special Summoned: You can activate this effect; Effect Monsters your opponent currently controls cannot activate their effects for the rest of this turn, also change their ATK to 0 until the end of this turn. (Quick Effect): You can Tribute this card; Special Summon 2 "Water Dragon" from your hand and/or Deck in Defense Position, ignoring their Summoning conditions.

Water Dragon Cluster

Speed Duel Tournament Pack 4

You can send 1 face-up "Umi" you control to the GY; destroy all other cards on the field.

Levia-Dragon - Daedalus

2022 Tin of the Pharaoh's Gods

If this card is Special Summoned: You can banish cards from the top of your opponent's Deck equal to the number of WATER monsters you control. You can target 1 Level 4 or lower WATER monster you control; increase its Level by its original Level. You can banish this card from your GY; 1 WATER monster on the field gains 100 ATK for each currently banished monster, until the end of this turn. You can only use each effect of "Guitar Gurnards Duonigis" once per turn.

Guitar Gurnards Duonigis

2 Level 4 monsters
If this card is Xyz Summoned: You can detach 1 material from this card; add 1 Level 4 or higher Normal Monster from your Deck or GY to your hand. If this card has a Normal Monster as material, it gains this effect.
● At the start of the Damage Step, if this card battles an opponent's monster with the same Attribute as a Normal Monster or "Magikey" monster in your GY: You can detach 1 material from this card; your opponent must send that monster to the GY.

Magikey Spirit - Vepartu

Legendary Duelists: Duels From the Deep

While "Umi" is on the field, each player can only control 1 face-up non-WATER monster. (If a player controls 2 or more, they must send some to the GY so they only control 1.) During your Main Phase: You can add from your Deck to your hand 1 "Umi", 1 "Kairyu-Shin" Spell/Trap, or 1 "Sea Stealth" Spell/Trap. You can only use this effect of "Ocean Dragon Lord - Kairyu-Shin" once per turn.

Ocean Dragon Lord - Kairyu-Shin

Hidden Arsenal: Chapter 1

Once per turn, you can select 2 "Ice Barrier" monsters in your Graveyard. Return the selected monsters to the Deck and each player draws 1 card.

Caravan of the Ice Barrier

"Deep Sea Diva" + 1+ non-Tuner monsters
Once per turn (Quick Effect): You can discard 1 Level 4 or lower WATER monster; this card gains 800 ATK until the end of this turn. If this Synchro Summoned card is sent to your GY: You can target 1 Level 5 or higher WATER monster in your GY, except "Deep Sea Repetiteur"; Special Summon it in Defense Position, also you cannot Special Summon monsters for the rest of this turn, except WATER monsters. You can only use this effect of "Deep Sea Repetiteur" once per turn.

Deep Sea Repetiteur

2021 Tin of Ancient Battles

If this card is added from the Deck or GY to your hand by an effect of a WATER monster: You can reveal this card; look at your opponent's hand. If this card is Special Summoned: You can send the top card of your Deck to the GY, then target 1 Level 4 or lower WATER monster in your GY, except "Deep Sea Artisan"; Special Summon it, but negate its effects. You can only use each effect of "Deep Sea Artisan" once per turn.

Deep Sea Artisan

You can discard this card and 1 WATER monster; look at your opponent's hand and banish 1 card from their hand face-up, until the End Phase. If this card is Special Summoned: You can send the top 3 cards of your Deck to the GY, then target 1 Level 4 or lower WATER monster in your GY, except "Deep Sea Minstrel"; place it on the top or bottom of the Deck. You can only use each effect of "Deep Sea Minstrel" once per turn.

Deep Sea Minstrel

1 Tuner + 1+ non-Tuner monsters
Your opponent cannot target a Synchro Monster that used this card as material with monster effects. You can only use each of the following effects of "Deep Sea Prima Donna" once per turn.
● You can target 1 of your opponent's banished cards; add to your hand, or Special Summon, 1 Level 4 or lower WATER monster from your Deck, and if you do, add that target to their hand.
● If this card is sent to the GY: You can target 1 banished card; shuffle it into the Deck.

Deep Sea Prima Donna

If this card is sent to the GY to activate a WATER monster's effect: You can make your opponent banish 1 card from their hand face-up, until the End Phase. If this card is Special Summoned: You can send the top 2 cards of your Deck to the GY, then target 1 Level 4 or lower WATER monster in your GY, except "Deep Sea Sentry"; add it to your hand. You can only use each effect of "Deep Sea Sentry" once per turn.

Deep Sea Sentry

Structure Deck: Freezing Chains

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by having exactly 5 WATER monsters in your GY. If this card is Special Summoned: Discard 2 random cards from your opponent's hand (or their entire hand, if less than 2). You can only use this effect of "Moulinglacia the Elemental Lord" once per turn. If this face-up card leaves the field, skip the Battle Phase of your next turn.

Moulinglacia the Elemental Lord

2020 Tin of Lost Memories

You can reveal this card in your hand; your opponent randomly chooses 1 card from your entire hand, then you discard the chosen card. Then, if the discarded card was not "Danger! Ogopogo!", Special Summon 1 "Danger! Ogopogo!" from your hand, and if you do, draw 1 card. If this card is discarded: You can send 1 "Danger!" card from your Deck to the GY, except "Danger! Ogopogo!". You can only use this effect of "Danger! Ogopogo!" once per turn.

Danger! Ogopogo!

"Gladiator Beast Vespasius" + 2 "Gladiator Beast" monsters
Must first be Special Summoned (from your Extra Deck) by shuffling the above cards you control into the Deck. (You do not use "Polymerization".) Once per turn, when your opponent activates a monster effect (Quick Effect): You can negate the activation, and if you do, destroy it. You choose the attack targets for your opponent's attacks. At the end of the Battle Phase, if this card battled: You can return this card to the Extra Deck; Special Summon 1 "Gladiator Beast" monster from your Deck.

Gladiator Beast Domitianus

At the start of the Damage Step, if your "Gladiator Beast" monster battles a monster: You can Special Summon this card from your hand. You can only use this effect of "Gladiator Beast Vespasius" once per turn. While you control this card, Special Summoned by the effect of a "Gladiator Beast" monster, all monsters you control gain 500 ATK. At the end of the Battle Phase, if this card battled: You can shuffle this card into the Deck; Special Summon 1 "Gladiator Beast" monster from your Deck, except "Gladiator Beast Vespasius".

Gladiator Beast Vespasius

2 Fish, Sea Serpent, and/or Aqua monsters
Monsters this card points to gain 500 ATK/DEF. You can only use each of the following effects of "Mermail Abyssalacia" once per turn.
● During your opponent's turn (Quick Effect): You can send 1 card from your hand to the GY; add 1 "Mermail" monster from your Deck to your hand.
● If this card in its owner's possession is destroyed by an opponent's attack or card effect: You can send 1 WATER monster from your Deck to the GY, then target 1 WATER monster in your GY; Special Summon it in Defense Position.

Mermail Abyssalacia

If an Xyz Monster is Special Summoned to your field (except during the Damage Step): You can Special Summon this card from your hand. If an Xyz Monster(s) is Special Summoned to your field while this card is in your GY, except the turn this card was sent to your GY (and except during the Damage Step): You can target 1 of those Xyz Monsters; attach this card to it as material. You can only use each effect of "Xyz Slidolphin" once per turn.

Xyz Slidolphin

Chaos Impact Special Edition

If this card is Normal or Special Summoned: You can target 1 WATER monster in your GY; this card gains ATK equal to that monster's ATK until the end of this turn. If this card is sent to the GY: You can target 1 WATER monster you control; it gains 1000 ATK until the end of this turn. You can only use each effect of "Brinegir" once per turn.

Brinegir

Speed Duel: Trials of the Kingdom

A sea dragon known as the King of the Ocean, it attacks its enemies with huge tidal waves.

Kairyu-Shin

Speed Duel: Attack from the Deep

If this card you control is destroyed by your opponent's card and sent to your GY: Send the top card of your Deck to the GY, then, if it is a WATER monster, draw 1 card.

Imairuka

If there is another face-up Fish, Sea Serpent, or Aqua monster on the field: You can Tribute this card, then target 1 Spell/Trap on the field; destroy that target.

Lost Blue Breaker

Savage Strike Special Edition

If this card is added from the Deck to your hand: You can reveal this card; Special Summon it. If this card is added from your GY to your hand by a card effect: You can reveal this card; Special Summon this card, but banish it when it leaves the field. You can only use 1 "Lappis Dragon" effect per turn, and only once that turn.

Lappis Dragon

If this card is Normal or Special Summoned: You can target 1 Level 4 or lower "T.G." monster in your GY, except "T.G. Screw Serpent"; Special Summon that monster, but its effects are negated. You can banish this card from your GY, then target 1 "T.G." monster you control; increase or reduce its Level by 1 until the end of this turn. You can only use each effect of "T.G. Screw Serpent" once per turn.

T.G. Screw Serpent

2018 Mega-Tin Mega Pack

If your opponent controls a monster and you control no monsters, you can Special Summon this card (from your hand). You can only Special Summon "Kaiser Sea Snake" once per turn this way. When Summoned this way: You can Special Summon 1 Level 8 Sea Serpent monster from your hand or GY, but its ATK/DEF become 0. If this card is Special Summoned, its Level becomes 4 and original ATK becomes 0.

Kaiser Sea Snake

Shadows in Valhalla

You can discard 3 other WATER monsters to the GY; Special Summon this card from your hand. When Summoned this way: You can target 1 "Abyss-" Spell/Trap in your GY; add that target to your hand. You can Tribute 1 other Attack Position "Mermail" monster; send 1 random card from your opponent's hand to the GY. You can only use this effect of "Mermail Abyssleed" once per turn.

Mermail Abyssleed

Invasion: Vengeance: Special Edition

FLIP: You can target Set cards on the field, equal to the number of "Subterror Behemoth" monsters you control; destroy them. You can only use this effect of "Subterror Behemoth Stygokraken" once per turn.
When a face-up monster you control is flipped face-down, if you control no face-up monsters: You can Special Summon this card from your hand in Defense Position. Once per turn: You can change this card to face-down Defense Position.

Subterror Behemoth Stygokraken

Premium Gold: Infinite Gold

2 Level 4 WATER monsters
When any player's monster declares an attack: You can detach 1 Xyz Material from this card; all monsters your opponent currently controls lose 1000 ATK until the end of this turn. When this card is destroyed by battle or card effect and sent to the Graveyard: You can target 1 other monster in your Graveyard; Special Summon it. You can only use each effect of "Number 37: Hope Woven Dragon Spider Shark" once per turn.

Number 37: Hope Woven Dragon Spider Shark

Crossed Souls: Advance Edition

[ Pendulum Effect ] 
When a monster is destroyed by battle: You can Special Summon 1 Normal Monster from your hand. You can only use this effect of "Sea Dragoons of Draconia" once per turn.

[ Monster Effect ] 
''Silently creeping in from the deep sea, elite black ops marine troops of the Draconia Empire wage an endless battle against the hated Principality of Dinon on the sea's opposite shores.''

Sea Dragoons of Draconia

The Secret Forces

If this card is Normal Summoned: Look at the top 3 cards of your Deck, you can reveal 1 Ritual Monster or 1 Ritual Spell Card among them and add it to your hand, also after that, place any remaining cards on the top of your Deck in any order.

Gishki Chain

If you Ritual Summon exactly 1 WATER Ritual Monster with a card effect that requires use of monsters, this card can be used as the entire requirement. You can discard this card; add 1 "Gishki" Ritual Spell Card from your Deck to your hand.

Gishki Shadow

If you Ritual Summon exactly 1 WATER Ritual Monster with a card effect that requires use of monsters, this card can be used as the entire requirement. You can discard this card; add 1 "Gishki" Ritual Monster from your Deck to your hand.

Gishki Vision

2014 Mega-Tin Mega Pack

You can Tribute this card and 1 Sea Serpent-Type monster; Special Summon 1 "Poseidra, the Atlantean Dragon" from your hand or Deck, then all monsters your opponent currently controls lose 300 ATK.

Legendary Atlantean Tridon

2014 Mega-Tins

2 Level 3 monsters
When this card is Special Summoned: You can attach 1 Level 3 WATER monster from your hand or your side of the field to this card as an Xyz Material. Once per turn: You can detach 1 Xyz Material from this card, then target 1 WATER monster you control; this turn, that monster can attack your opponent directly, also other monsters cannot attack.

Number 47: Nightmare Shark

Battle Pack 3: Monster League

All Fish, Sea Serpent, and Aqua-Type monsters you control gain 400 ATK.

Spined Gillman

3 Level 3 monsters
Banish any monster destroyed by battle with this card. Once per turn, during either player's turn: You can detach 1 Xyz Material from this card, then target 1 face-up monster on the field; it loses 800 ATK, also its effects are negated. These changes last until the end of this turn.

Tri-Edge Levia

Realm of Light Structure Deck

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by having 4 or more LIGHT monsters in your Graveyard, and cannot be Special Summoned by other ways. Once per turn: You can target 1 Field Spell Card and 2 other cards on the field; destroy them.

Lightray Daedalus

War of the Giants: Round 2

This card can attack your opponent directly. At the end of the Battle Phase, if this card attacked directly: Banish this card until your next Standby Phase.