Atlantean Dragoons

Sea Serpent/Effect

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 Heavy Infantry

Sea Serpent/Effect

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 Marksman

Sea Serpent/Effect

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.

Deep Sea Diva

Sea Serpent/Tuner

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

Fishborg Launcher

Fish/Tuner

During your Main Phase, if the only monsters in your Graveyard, other than "Fishborg Launcher", are WATER monsters: You can Special Summon this card from your Graveyard. If this card is Special Summoned by this effect, banish it when it leaves the field. This card cannot be used as a Synchro Material Monster, except for the Synchro Summon of a WATER monster. You can only use the effect of "Fishborg Launcher" once per turn.

Genex Controller

Machine/Tuner

Genex Undine

Aqua/Effect

When this card is Normal Summoned: You can send 1 WATER monster from your Deck to the Graveyard; add 1 "Genex Controller" from your Deck to your hand.

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 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 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 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.

Moulinglacia the Elemental Lord

Sea Serpent/Effect

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.

Neptabyss, the Atlantean Prince

Sea Serpent/Effect

You can send 1 "Atlantean" monster from your Deck to your 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.

Poseidra, the Atlantean Dragon

Sea Serpent/Effect

You can Tribute 3 Level 3 or lower WATER monsters; Special Summon this card from your hand or Graveyard. When you do: Return all Spell and Trap Cards on the field to the hand, and if you do, if 3 or more cards are returned to the hand by this effect, all monsters your opponent currently controls lose 300 ATK for each.

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.

Deep Sea Aria

Banish 1 WATER monster from your GY; add 1 Level 4 or lower Sea Serpent monster from your Deck to your hand. You can only activate 1 "Deep Sea Aria" per turn.

Monster Reborn

Special Summon 1 monster from either player's Graveyard to your side of the field.

Moray of Greed

Shuffle 2 WATER monsters from your hand into the Deck, then draw 3 cards.

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.

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.

Adamancipator Risen - Dragite

Rock/Synchro/Effect

1 Tuner + 1+ non-Tuner monsters
During your Main Phase: You can excavate the top 5 cards of your Deck, and if you do, you can return cards your opponent controls to the hand, up to the number of excavated Rock monsters, also place the excavated cards on the bottom of your Deck in any order. When your opponent activates a Spell/Trap Card or effect, while a WATER monster is in your GY (Quick Effect): You can negate the activation, and if you do, destroy it. You can only use each effect of "Adamancipator Risen - Dragite" once per turn.

Armory Arm

Machine/Synchro/Effect

1 Tuner + 1 or more non-Tuner monsters // Once per turn, you can equip this card to a monster OR unequip it to Special Summon this card in face-up Attack Position. While equipped to a monster by this effect, that monster gains 1000 ATK. When the equipped

Brionac, Dragon of the Ice Barrier

Sea Serpent/Synchro/Effect

1 Tuner + 1 or more non-Tuner monsters
You can discard any number of cards to the Graveyard, 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.

Coral Dragon

Dragon/Synchro/Tuner/Effect

1 Tuner + 1 or more non-Tuner monsters
Once per turn: You can discard 1 card, then target 1 card your opponent controls; destroy it. If this Synchro Summoned card is sent from the field to the Graveyard: You can draw 1 card. You can only use this effect of "Coral Dragon" once per turn.

Gungnir, Dragon of the Ice Barrier

Dragon/Synchro/Effect

1 Tuner + 1 or more WATER non-Tuner Monsters. // Once per turn, you can discard up to 2 cards from your hand to the Graveyard to select and destroy an equal number of cards your opponent controls.

Trishula, Dragon of the Ice Barrier

Dragon/Synchro/Effect

1 Tuner + 2+ non-Tuner monsters
When this card is Synchro Summoned: You can banish up to 1 card each from your opponent's hand, field, and GY. (The card in the hand is chosen at random.)

White Aura Bihamut

Fish/Synchro/Effect

1 Tuner Synchro Monster + 1+ non-Tuner monsters
During your turn, when this card is Synchro Summoned: You can Special Summon 1 "Divine Dragon Token" (Fish/WATER/Level 10/ATK 3300/DEF 3000) in Defense Position. Once per opponent's turn, while you control no Tokens (Quick Effect): You can Special Summon 1 "Divine Dragon Token". If this card you control is destroyed by an opponent's card effect and sent to your GY, while you control a "Divine Dragon Token": You can Special Summon this card in Defense position.

White Aura Dolphin

Fish/Synchro/Effect

1 Tuner + 1+ non-Tuner monsters
Once per turn: You can target 1 face-up monster your opponent controls; its ATK becomes half its original ATK until the end of this turn. If this card you control is destroyed by an opponent's card (by battle or card effect) and sent to your GY: You can banish 1 other WATER monster from your GY; Special Summon this card, and if you do, it is treated as a Tuner.

White Aura Whale

Fish/Synchro/Effect

1 WATER Tuner + 1+ non-Tuner WATER monsters
When this card is Synchro Summoned: You can destroy all your opponent's Attack Position monsters. This card can make up to 2 attacks on monsters during each Battle Phase. If this card attacks a Defense Position monster, inflict piercing battle damage. If this card you control is destroyed by an opponent's card (by battle or card effect) and sent to your GY: You can banish 1 other WATER monster from your GY; Special Summon this card, and if you do, it is treated as a Tuner.

Abyss Dweller

Sea Serpent/Xyz/Effect

2 Level 4 monsters
While this card has an Xyz Material attached that was originally WATER, all WATER monsters you control gain 500 ATK. Once per turn, during either player's turn: You can detach 1 Xyz Material from this card; any card effects that activate in your opponent's Graveyard cannot be activated this turn.

Bahamut Shark

Sea Serpent/Xyz/Effect

2 Level 4 WATER monsters
Once per turn: You can detach 1 Xyz 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.

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

Number 11: Big Eye

Spellcaster/Xyz/Effect

2 Level 7 monsters
Once per turn: You can detach 1 material from this card, then target 1 monster your opponent controls; take control of that monster. This card cannot attack the turn this effect is activated.