Magnificent Monsters

Add 1 Level 7 or lower monster from your Deck to your hand, that mentions "Umi", or is a WATER Normal Monster, then if "Umi" is on the field, you can Special Summon 1 WATER Normal Monster from your Deck. You can only activate 1 "Fish Sonar" per turn.

Fish Sonar

The Lost Art Promotion 2024 H

While "Umi" is on the field, this card is unaffected by Spell effects and cannot be targeted for attacks, but does not prevent your opponent from attacking you directly.

The Legendary Fisherman

Speed Duel Tournament Pack 6

[Flip this card over when you activate this Skill.]

If you control "The Legendary Fisherman", you can activate "Umi" directly from your Deck or GY. This Skill can only be used once per Duel.
Once per turn, when "The Legendary Fisherman" you control destroys a monster by battle or inflicts battle damage to your opponent, you can Special Summon 1 Level 4 or lower WATER monster from your Deck or GY in Defense Position.

Catch of the Day

Speed Duel: Streets of Battle City

(This card's name is always treated as "Umi".)
All WATER monsters on the field gain 200 ATK/DEF. Reduce the Level of all WATER monsters in both players' hands and on the field by 1.

A Legendary Ocean

You can Ritual Summon this card with "Fortress Whale's Oath".

Fortress Whale

This card is used to Ritual Summon "Fortress Whale". You must also Tribute monsters from your hand or field whose total Levels equal 7 or more.

Fortress Whale's Oath

As long as this card remains face-up on the field, the field is treated as "Umi" (however there is no increasing or decreasing of ATK/DEF due to "Umi"'s effect). If there is an active Field Spell Card on the field, this effect is not applied.

Maiden of the Aqua

This card's name becomes "The Legendary Fisherman" while on the field or in the GY. While "Umi" is on the field, this card is unaffected by other monsters' effects. If this face-up card is destroyed by battle, or leaves the field because of an opponent's card effect while its owner controls it: You can add 1 Level 7 WATER monster from your Deck to your hand.

The Legendary Fisherman II

Activate only while "Umi" is on the field. While "Umi" is face-up on the field, you take no Battle Damage from attacking monsters. Destroy this card when "Umi" leaves the field.

Tornado Wall

All Fish, Sea Serpent, Thunder, and Aqua monsters on the field gain 200 ATK/DEF, also all Machine and Pyro monsters on the field lose 200 ATK/DEF.

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

Legendary Duelists: Duels From the Deep

If this card is in your hand or GY: You can Tribute 2 WATER monsters; Special Summon this card. You can only use this effect of "Citadel Whale" once per turn. If this card is Special Summoned: You can Set 1 "Sea Stealth Attack" directly from your Deck. Once per turn, when your opponent activates a card or effect that targets 1 WATER monster you control (and no other cards) (Quick Effect): You can negate the activation, and if you do, destroy that card.

Citadel Whale

If "Umi" is on the field (Quick Effect): You can target 1 WATER monster you control, except "Doom Kraken", and 1 monster your opponent controls; Special Summon this card from your hand, and if you do, return that monster you control to the hand, and if you do that, destroy that opponent's monster. When an opponent's monster declares an attack: You can return this card to the hand, and if you do, negate that attack. You can only use each effect of "Doom Kraken" once per turn.

Doom Kraken

You can send 1 "Umi" from your hand, Deck, or face-up field to the GY; Special Summon 1 WATER monster from your hand. When your opponent activates a monster effect, or Spell Card or effect, while "Umi" is on the field (Quick Effect): You can negate that effect, then, you can make this card gain 600 ATK/DEF. You can only use each effect of "Electric Jellyfish" once per turn.

Electric Jellyfish

Add 1 "Torrential Tribute" from your Deck to your hand. If a WATER monster(s) you control would be destroyed by card effect, you can banish this card from your GY instead. You can only use each effect of "Fury of Kairyu-Shin" once per turn.

Fury of Kairyu-Shin

This card's name is treated as "Umi". All WATER monsters gain 200 ATK and DEF. Once per turn, during your Main Phase: You can have all WATER monsters you currently control gain Levels equal to the number of WATER monsters you currently control, until the End Phase.

Lemuria, the Forgotten City

If "Umi" is on the field: Target monsters your opponent controls, up to the number of WATER monsters you control whose original Levels are 5 or higher; destroy them, and if you do, the zones they were in cannot be used until the end of the next turn. You can only activate 1 "Rage of Kairyu-Shin" per turn.

Rage of Kairyu-Shin

When this card is activated: You can activate 1 "Umi" from your hand or GY. While "Umi" is on the field, this face-up card gains these effects.
● Once per turn: You can banish 1 WATER monster you control until the End Phase; this turn, face-up Spells/Traps you control cannot be destroyed by your opponent's card effects (even if this card leaves the field).
● At the start of the Damage Step, if your WATER monster whose original Level is 5 or higher battles an opponent's monster: Destroy that opponent's monster.

Sea Stealth Attack

Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by Tributing 1 "The Legendary Fisherman". When this card is Special Summoned: You can banish all monsters your opponent controls, also this card cannot attack this turn. Cannot be destroyed by battle or card effects, also unaffected by Spell/Trap effects. Once per turn: You can return as many of your opponent's banished cards as possible to their GY, and if you do, the first battle or effect damage your opponent takes this turn becomes doubled.

The Legendary Fisherman III

2021 Tin of Ancient Battles

(This card's name is always treated as "Umi".)
When this card is activated: You can place 1 WATER monster from your Deck on top of your Deck. Once per turn: You can target 1 WATER monster you control; increase its Level by 1 or 2 until the end of this turn (even if this card leaves the field). Once per turn, during your Main Phase, if you Special Summon a WATER Synchro Monster: You can look at your opponent's hand, and if you do, banish 1 card from it face-up until the End Phase.

Magellanica, the Deep Sea City

Speed Duel: Trials of the Kingdom

Activate this Skill during your Main Phase, while you control "Kairyu-Shin". When this Skill is activated, you can activate "Umi" directly from your hand, Deck or GY. While you control "Kairyu-Shin", all WATER monsters you control are unaffected by Trap effects. If "Kairyu-Shin" you control leaves the field, draw 2 cards, and if you do, flip this card over.

Terror from the Deep!

Speed Duel: Attack from the Deep

[At the start of the Duel, place this card in your Field Zone and flip it over.]

All Fish, Sea Serpent, Thunder, and Aqua monsters on the field gain 200 ATK/DEF. All Machine and Pyro monsters on the field lose 200 ATK/DEF. This card's name becomes "Umi" while on the field.

Mythic Depths

Battle Pack 3: Monster League

While this card is on the field, this card's name becomes "Umi". Once per turn: You can target 1 Level 4 or lower Fish, Sea Serpent or Aqua-Type monster you control; banish that target. During your End Phase: Special Summon the monster(s) banished by this effect.

Forgotten Temple of the Deep

Abyss Rising: Special Edition

Send 1 face-up "Umi" you control to the Graveyard; send all Spell and Trap Cards on the field to the Graveyard.

Abyss-strom

Realm of the Sea Emperor Structure Deck

You can send 1 face-up "Umi" you control to the Graveyard to target up to 2 cards your opponent controls; send those targets to the Graveyard.

Codarus

World Championship 2010 Card Pack

This card cannot be Normal Summoned or Set. This card cannot be Special Summoned except by Tributing 1 "Levia-Dragon - Daedalus". You can send "Umi" you control to the Graveyard to send all cards in both players' hands and on the field to the Graveyard, except this card.

Ocean Dragon Lord - Neo-Daedalus

Dark Revelation Volume 2

While "Umi" is face-up on the field, this card can attack your opponent's Life Points directly.

Amphibious Bugroth MK-3

While "Umi" is face-up on the field, this card is unaffected by any Spell Cards.

Cannonball Spear Shellfish

While "Umi" is face-up on the field, this card can attack twice during the same Battle Phase.

Mermaid Knight

Torpedo Fish

Dark Beginning 1

As long as "Umi" is face-up on the field, this card is unaffected by any Spell Cards.