Abyss Warrior

Aqua/Effect

Once per turn: You can discard 1 WATER monster to the Graveyard, then target 1 monster in either player's Graveyard; return that target to either the top or bottom of the Deck.

Mermail Abyssbalaen

Aqua/Effect

You can discard 4 other "Mermail" monsters to the Graveyard; Special Summon this card from your hand. When you do: Target cards your opponent controls, up to the number of "Mermail" monsters in your Graveyard (if possible); this card gains 500 ATK, and if it does, destroy thos targets (if any). You can Tribute 1 other face-up Attack Position "Mermail" monster; this card gains the following effect this turn. // * At the start of the Damage Step, if this card battles a Defense Position monster. Destroy that monster.

Mermail Abyssdine

Aqua/Effect

When this card is added from your Deck or Graveyard to your hand by a card effect, if you control a face-up "Mermail" monster: You can Special Summon this card from your hand. When this card is Special Summoned by the effect of a "Mermail" monster: You can target 1 Level 3 or lower "Mermail" monster in your Graveyard; Special Summon that target. You can only use the effect of "Mermail Abyssdine" once per turn.

Mermail Abyssgunde

Aqua/Effect

If this card is discarded to the Graveyard: You can target 1 "Mermail" monster in your Graveyard, except "Mermail Abyssgunde"; Special Summon that target. You can only use the effect of "Mermail Abyssgunde" once per turn.

Mermail Abysshilde

Aqua/Effect

If this card is sent to the Graveyard: You can Special Summon 1 "Mermail" monster from your hand, except "Mermail Abysshilde". You can only use the effect of "Mermail Abysshilde" once per turn.

Mermail Abyssleed

Sea Serpent/Effect

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

Mermail Abysslinde

Aqua/Effect

If this card on the field is destroyed and sent to the Graveyard: You can Special Summon 1 "Mermail" monster from your Deck, except "Mermail Abysslinde". You can only use the effect of "Mermail Abysslinde" once per turn.

Mermail Abysslung

Fish/Effect

Your opponent's monsters cannot target other face-up WATER monsters you control for attacks. All WATER monsters you control gain 300 ATK.

Mermail Abyssmegalo

Sea Serpent/Effect

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

Mermail Abyssnose

Fish/Effect

When this card destroys an opponent's monster by battle and sends it to the Graveyard: You can discard 1 WATER monster to the Graveyard; Special Summon 1 "Mermail" monster from your Deck in face-up Defense Position. You can only use the effect of "Mermail Abyssnose" once per turn.

Mermail Abysspike

Fish/Effect

When this card is Normal or Special Summoned: You can discard 1 WATER monster to the Graveyard; add 1 Level 3 WATER monster from your Deck to your hand. You can only use the effect of "Mermail Abysspike" once per turn.

Mermail Abyssteus

Aqua/Effect

You can discard 1 other WATER monster to the GY; Special Summon this card from your hand. If Summoned this way: Add 1 Level 4 or lower "Mermail" monster from your Deck to your hand. You can only use this effect of "Mermail Abyssteus" once per turn.

Mermail Abyssturge

Fish/Effect

When this card is Normal or Special Summoned: You can discard 1 WATER monster to the Graveyard, then target 1 Level 3 or lower WATER monster in your Graveyard; add that target to your hand. You can only use the effect of "Mermail Abyssturge" once per turn.

True King Bahrastos, the Fathomer

Wyrm/Effect

If this card is in your hand: You can destroy 2 other monsters in your hand and/or face-up on your field, including a WATER monster, and if you do, Special Summon this card, and if you do that, you can banish up to 2 Spell/Trap Cards from your opponent's field and/or Graveyard, if both the destroyed monsters were WATER. If this card is destroyed by card effect: You can Special Summon 1 non-WATER Wyrm-Type monster from your Deck in Defense Position. You can only use each effect of "True King Bahrastos, the Fathomer" once per turn.

A Legendary Ocean

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

Abyss-scale of Cetus

Equip only to a "Mermail" monster. It gains 800 ATK. When the effect of a Trap Card that was activated on your opponent's side of the field resolves, negate that effect, then send this card to the Graveyard.

Abyss-scale of the Kraken

Equip only to a "Mermail" monster. It gains 400 ATK. Negate any monster effect that activates on your opponent's side of the field, and if you do, send this card to the Graveyard.

Abyss-scale of the Mizuchi

Equip only to a "Mermail" monster. It gains 800 ATK. When a Spell effect that was activated on your opponent's side of the field resolves, negate that effect, then send this card to the Graveyard.

Aquarium Set

All WATER monsters you control gain 300 ATK and DEF. All "Aquaactress" monsters you control gain 300 ATK and DEF. If this card is sent from the field to the Graveyard: You can target 1 Aqua-Type monster in your Graveyard; Special Summon it, also you cannot Special Summon monsters for the rest of this turn, except Aqua-Type monsters.

Aquarium Stage

WATER monsters you control cannot be destroyed by battle with a non-WATER monster. "Aquaactress" monsters you control are unaffected by your opponent's monster effects. If this card is sent from the field to the Graveyard: You can target 1 Aqua-Type monster in your Graveyard; Special Summon it, also you cannot Special Summon monsters for the rest of this turn, except Aqua-Type monsters.

Sea Lord's Amulet

Send this card to the Graveyard during your opponent's 3rd End Phase after activation. WATER monsters you control cannot be destroyed by your opponent's card effects.

Abyss Stungray

Special Summon this card as an Effect Monster (Thunder-Type/LIGHT/Level 5/ATK 1900/DEF 0). (This card is also still a Trap Card). If Summoned this way, this card cannot be destroyed by battle.

Abyss-scorn

Target 1 face-up "Mermail" monster you control; it gains 1000 ATK until the End Phase. When this Set card is sent to the Graveyard: Target 1 monster your opponent controls; send it to the Graveyard.

Abyss-sphere

Special Summon 1 "Mermail" monster from your Deck. Its effects are negated. You cannot activate any Spell Cards. When this card leaves the field, destroy that monster. Destroy this card during your opponent's next End Phase after activation.

Abyss-squall

Target 3 "Mermail" monsters in your Graveyard; Special Summon those targets in face-up Defense Position. Their effects are negated and they cannot declare an attack. Destroy them during the End Phase.

Abyss-strom

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

Torrential Reborn

When a face-up WATER monster you control is destroyed by battle or by a card effect and sent to the Graveyard: Special Summon the monster destroyed and sent from the field to your Graveyard at that time, then inflict 500 damage to your opponent for each of those Special Summoned monsters. You can only activate 1 "Torrential Reborn" per turn.

Mermail Abyssalacia

Sea Serpent/Link/Effect

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.

Mistar Boy

Aqua/Link/Effect

2 WATER monsters
All WATER monsters on the field gain 500 ATK and DEF, also all FIRE monsters on the field lose 400 ATK and DEF. If this card is destroyed by battle or card effect: You can target 1 WATER monster in your GY; add it to your hand. You can only use this effect of "Mistar Boy" once per turn.

Mermail Abyssgaios

Aqua/Xyz/Effect

While this face-up card has Xyz Material, Level 5 or higher monsters cannot attack. Once per turn, during either player's turn: You can detach 1 Xyz Material from this card; negate the effects of all face-up monsters your opponent currently controls that have less ATK than this card, until the end of the turn.

Mermail Abysstrite

Sea Serpent/Xyz/Effect

3 Level 3 monsters // During either player's turn, when your opponent targets exactly 1 face-up "Mermail" monster you control for an attack, or with a Spell/Trap effect that could have targeted this card (except during the Damage Step): You can detach 1 Xyz Material from this card; that attack