OTS Tournament Pack 28

Tribute 1 "Alien" monster. Destroy all face-up monsters without A-Counters your opponent controls. Until the end of your opponent's 3rd turn after this card's activation, place 1 A-Counter on each monster they Summon.

Planet Pollutant Virus

25th Anniversary Tin: Dueling Mirrors

Cannot be destroyed by battle or card effects while your opponent has a face-up card in their Field Zone. You can only use each of the following effects of "I.A.S. -Invasive Alien Species-" once per turn. If your opponent has a face-up card in their Field Zone: You can target 1 monster they control; destroy it, and if you do, this card gains 1000 ATK. If your opponent has a face-up card in their Field Zone, while this card is in your GY: You can Special Summon this card.

I.A.S. -Invasive Alien Species-

Ghosts From the Past: The 2nd Haunting

When this card is Normal Summoned, you can Special Summon 1 Level 4 or lower "Alien" monster from your Graveyard. Destroy it during the End Phase.

Alien Ammonite

Dawn of Majesty

If this card is sent to the GY: You can target 1 face-up monster on the field; place 2 A-Counters on it. During your Main Phase, except the turn this card was sent to the GY: You can banish this card from your GY, then target 1 card with an A-Counter; destroy it. You can only use each effect of "Alien Stealthbuster" once per turn.

Alien Stealthbuster

2+ Reptile monsters
Monsters your opponent controls with A-Counters are changed to Defense Position, also neither player can activate their effects. You can only use each of the following effects of "Cosmic Slicer Zer'oll" once per turn. If this card is Link Summoned: You can add 1 card from your Deck to your hand that has an effect that places A-Counter(s). You can remove 2 A-Counters from anywhere on the field; immediately after this effect resolves, Normal Summon 1 Reptile monster.

Cosmic Slicer Zer'oll

OTS Tournament Pack 16

When a Reptile-Type monster you control is destroyed by battle with an opponent's attacking monster and sent to the Graveyard: Take control of the opponent's monster, and if you do, it becomes Reptile-Type.

Alien Brain

Duel Overload

2 Reptile monsters
(Quick Effect): You can discard 1 monster; place A-Counters equal to its original Level on face-up monster(s) on the field, distributed as you wish. If this card is destroyed by battle or card effect and sent to the GY: You can Special Summon non-Link Reptile monsters with different names from your GY, up to the number of monsters your opponent controls with A-Counters. You can only use each effect of "Alien Shocktrooper M-Frame" once per turn.

Alien Shocktrooper M-Frame

Invasion: Vengeance: Special Edition

Target 1 face-up monster on the field; send 1 "Alien" monster from your Deck to the Graveyard, and if you do, place A-Counters on that monster equal to the Level of the sent monster. During your Main Phase, except the turn this card was sent to the Graveyard: You can banish this card from your Graveyard; add 1 "Alien" monster from your Deck to your hand.

"A" Cell Recombination Device

Raging Battle: Special Edition

When you Normal Summon an "Alien" monster, you can Special Summon this card from your hand. When you do, place 2 A-Counters on face-up monster(s) your opponent controls.

Alien Dog

Crimson Crisis: Special Edition

Place 1 A-Counter on all monsters Special Summoned to your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)

Alien Kid

You can remove 2 A-Counters from anywhere on the field to Special Summon this card from your hand. Once per turn, you can place 1 A-Counter on each face-up monster your opponent controls. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) You can only control 1 "Alien Overlord".

Alien Overlord

Each time a face-up "Alien" monster(s) is destroyed, place 1 A-Counter on this card. Once per turn, you can remove 2 A-Counters from anywhere on the field to Special Summon 1 "Alien" monster from your Graveyard.

Code A Ancient Ruins

"Alien Ammonite" + 1 or more non-Tuner "Alien" monsters
Once per turn, you can select any number of face-up Spell or Trap Cards. Return those cards to their owners' hands, and distribute new A-Counters among monsters on the field equal to the number of cards returned. Once per turn, you can remove 2 A-Counters from anywhere on the field to destroy 1 card your opponent controls.

Cosmic Fortress Gol'gar

Destroy 1 monster on the field with an A-Counter. Then, you can Special Summon 1 Level 4 "Alien" monster from your Deck. Destroy it during the End Phase.

Mysterious Triangle

Champion Pack: Game Eight

If this card destroys a monster with an A-Counter by battle and sends it to the Graveyard, Special Summon the destroyed monster to your side of the field at the end of the Battle Phase. When this card is removed from the field, all monsters that were Special Summoned by this card's effect are destroyed.

Alien Mother

When this card is destroyed by battle and sent to the Graveyard, place 2 A-Counters on the monster that destroyed it. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)

Alien Warrior

Activate only when an opponent's monster with an A-Counter declares an attack. Destroy all Attack Position monsters your opponent controls.

Cell Explosion Virus

Light of Destruction: Special Edition

Gain control of a monster that attacks this face-up Attack Position card, at the end of the Battle Phase.

Interplanetary Invader "A"

Gladiator's Assault: Special Edition

Each time an A-Counter(s) is removed from play by a card effect, place 1 A-Counter on this card. When this card is destroyed, distribute the A-Counters on this card among face-up monsters.

"A" Cell Incubator

This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:
● During your Main Phase, you can select 1 monster your opponent controls with an A-Counter(s), and take control of it while this card is on the field. During each of your End Phases, remove 1 A-Counter from each controlled monster. If all A-Counters are removed from one of these monsters, destroy it.

Alien Hypno

Once per turn, you can remove 1 A-Counter from an opponent's monster to destroy 1 Spell or Trap Card. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)

Alien Telepath

Destroy 1 face-up monster with an A-Counter(s), and then inflict 1000 damage to each player.

Detonator Circle "A"

Select a monster you control and a monster with an A-Counter(s) your opponent controls. Switch control of those monsters.

Interdimensional Warp

Tactical Evolution: Special Edition

The Aliens have used a mysterious biological substance to create a supreme race of soldiers. They do not have the natural powers of the other Aliens, but can make stunning physical attacks.

Alien Shocktrooper

Force of the Breaker: Special Edition

During each of your Standby Phases, put 1 A-Counter on 1 face-up monster your opponent controls.

"A" Cell Breeding Device

Activate only while you control an "Alien" monster. Select and take control of up to 3 of your opponent's monsters that each have an A-Counter(s) on them. This card is destroyed during the End Phase of the turn it is activated.

Mass Hypnosis

If your opponent's monster battles an "Alien" monster you control, the opponent's monster loses 300 ATK and DEF during damage calculation only.

Otherworld - The "A" Zone

Strike of Neos: Special Edition

Select 1 face-up "Alien" monster you control. Destroy it and distribute new A-Counters equal to its Level among your opponent's face-up monsters.

"A" Cell Scatter Burst

This card is changed to Defense Position when it is Normal Summoned or Flip Summoned. Monsters with A-Counters cannot declare an attack.

Alien Psychic

Cyberdark Impact

Once per turn, this card can move to an adjacent (horizontal) unoccupied Monster Card Zone. If no Spell, Trap or Monster Card on your opponent's side of the field is in the same column as this card, it can attack your opponent directly.

Alien Infiltrator

The effects of Effect Monsters with A-Counters are negated, except for "Alien Mars".

Alien Mars

Place 1 A-Counter on 1 face-up monster on your opponent's side of the field.

Corruption Cell "A"

Power of the Duelist

FLIP: Place 1 A-Counter on 1 face-up monster on your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.) After this card has been flipped face-up, when it is destroyed by battle and sent to the Graveyard, draw 1 card.

Alien Grey

If this card destroys a monster with an A-Counter by battle, it can attack once again in a row.

Alien Hunter

You can Tribute 1 face-up Level 3 or lower monster on your opponent's side of the field to Special Summon this card to your opponent's side of the field. If you Special Summon this monster this way, place 1 A-Counter on this card, and you cannot Normal Summon or Set the same turn. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)

Alien Skull

Select 1 monster with at least 1 A-Counter on your opponent's side of the field and take control of that monster. During each of your End Phases, remove 1 A-Counter from that controlled monster. If all A-Counters are removed from that monster, or that monster is destroyed, destroy this card.

Brainwashing Beam

If you're Tributing a monster on your side of the field that is owned by your opponent, this card can be Normal Summoned with 1 Tribute. Once per turn, you can place 1 A-Counter on a monster on your opponent's side of the field. (If a monster with an A-Counter battles an "Alien" monster, it loses 300 ATK and DEF for each A-Counter during damage calculation only.)

Cosmic Horror Gangi'el

Send any number of monsters from your side of the field to the Graveyard to activate this card. Select from your Deck 1 "Alien" monster whose Level is equal to the total Levels of the sent monsters, and Special Summon it. If you fail to find a monster to Special Summon, you take 2000 damage.

Crop Circles

While this card is face-up on the field, you can select and add 1 "Alien" card from your Deck to your hand instead of conducting your normal draw during your Draw Phase.

Flying Saucer Muusik'i

Send 1 "Alien" monster from your side of the field to the Graveyard to activate this card. Destroy 1 Spell or Trap Card on the field.