Buzzsaw Shark

Fish/Effect

You can target 1 WATER monster you control; Special Summon from your Deck in Defense Position, 1 Fish monster with the same Level as that monster, but with a different name, and if you do, it cannot activate its effects this turn, also, you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Xyz Monsters. You can only use this effect of "Buzzsaw Shark" once per turn. If this card is used for the Xyz Summon of a WATER monster, it can be treated as a Level 3 or 5 monster.

Flip Flop Frog

Aqua/Effect

Once per turn, you can flip this card into face-down Defense Position. When this card is flipped face-up, you can return a number of monsters your opponent controls to their owner(s) hand equal to the number of Frog monsters you control.

Lantern Shark

Fish/Effect

If this card is Normal or Special Summoned: You can activate this effect; Special Summon 1 Level 3, 4, or 5 WATER monster from your hand in Defense Position, except "Lantern Shark", also, you cannot Special Summon monsters from the Extra Deck for the rest of this turn, except Xyz Monsters. You can only use this effect of "Lantern Shark" once per turn. If this card is used for the Xyz Summon of a WATER monster, it can be treated as a Level 3 or 5 monster.

Ronintoadin

Aqua/Effect

Cannot be used as a Synchro Material. This card's name becomes "Des Frog" while it is on the field. If this card is in your Graveyard: You can banish 1 "Frog" monster from your Graveyard; Special Summon this card.

Silent Angler

Fish/Effect

If you control a WATER monster, you can Special Summon this card (from your hand), but you cannot Special Summon monsters from your hand for the rest of this turn.

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.

Number 37: Hope Woven Dragon Spider Shark

Sea Serpent/Xyz/Effect

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.

Absolute King Back Jack

Fiend/Effect

During your opponent's turn (Quick Effect): You can banish this card from the GY; excavate the top card of your Deck, and if it is a Normal Trap Card, Set it to your field. Otherwise, send it to the GY. That Set card can be activated during this turn. If this card is sent to the GY: You can look at 3 cards from the top of your Deck, then place them on the top of the Deck in any order. You can only use each effect of "Absolute King Back Jack" once per turn.

Dupe Frog

Aqua/Effect

This card's name becomes "Des Frog" while it is on the field. Monsters your opponent controls cannot target monsters for attacks, except this one. When this card is sent from the field to the Graveyard: You can add 1 "Frog" monster from your Deck or Graveyard to your hand, except "Dupe Frog".

Ronintoadin

Aqua/Effect

Cannot be used as a Synchro Material. This card's name becomes "Des Frog" while it is on the field. If this card is in your Graveyard: You can banish 1 "Frog" monster from your Graveyard; Special Summon this card.

Swap Frog

Aqua/Effect

You can Special Summon this card (from your hand) by discarding 1 other WATER monster. When this card is Summoned: You can send 1 Level 2 or lower Aqua-Type WATER monster from your Deck or face-up from your field to the Graveyard. Once per turn: You can return 1 monster you control to the hand; you can Normal Summon 1 "Frog" monster during your Main Phase this turn, except "Swap Frog", in addition to your Normal Summon/Set. (You can only gain this effect once per turn.)

Reasoning

Your opponent declares a monster Level from 1 to 12. Excavate cards from the top of your Deck until you excavate a monster that can be Normal Summoned/Set. If that monster is the same Level as the one declared by your opponent, send all excavated cards to the GY. If not, Special Summon the excavated monster, also send the remaining cards to the GY.

Infinite Impermanence

Target 1 face-up monster your opponent controls; it has its effects negated (until the end of this turn), then if this card is activated while it was Set, negate the effects of other Spells/Traps in this card's column this turn. If you control no cards, you can activate this card from your hand.

Lost Wind

Target 1 face-up Special Summoned monster on the field; it has its effects negated, also its original ATK is halved. If a monster is Special Summoned from your opponent's Extra Deck, while this card is in the GY (except during the Damage Step): You can Set this card, but banish it when it leaves the field.

Needlebug Nest

Send the top 5 cards of your Deck to the Graveyard.

Paleozoic Canadia

Target 1 face-up monster your opponent controls; change it to face-down Defense Position. Once per Chain, when a Trap Card is activated while this card is in your GY: You can Special Summon this card as a Normal Monster (Aqua/WATER/Level 2/ATK 1200/DEF 0). (This card is NOT treated as a Trap.) If Summoned this way, this card is unaffected by monster effects, also banish it when it leaves the field.

Paleozoic Dinomischus

Target 1 face-up card on the field; discard 1 card, and if you do, banish it. Once per Chain, when a Trap Card is activated while this card is in your Graveyard: Special Summon this card as a Normal Monster (Aqua-Type/WATER/Level 2/ATK 1200/DEF 0). (This card is NOT treated as a Trap Card.) If Summoned this way, this card is unaffected by monster effects, also banish it when it leaves the field.

Paleozoic Leanchoilia

Target 1 banished card; return it to the Graveyard. Once per Chain, when a Trap Card is activated while this card is in your Graveyard: Special Summon this card as a Normal Monster (Aqua-Type/WATER/Level 2/ATK 1200/DEF 0). (This card is NOT treated as a Trap Card.) If Summoned this way, this card is unaffected by monster effects, also banish it when it leaves the field.

Paleozoic Marrella

Send 1 Trap Card from your Deck to the Graveyard. Once per Chain, when a Trap Card is activated while this card is in your Graveyard: Special Summon this card as a Normal Monster (Aqua-Type/WATER/Level 2/ATK 1200/DEF 0). (This card is NOT treated as a Trap Card.) If Summoned this way, this card is unaffected by monster effects, also banish it when it leaves the field.

Paleozoic Olenoides

Target 1 Spell/Trap Card on the field; destroy it. Once per Chain, when a Trap Card is activated while this card is in your Graveyard: Special Summon this card as a Normal Monster (Aqua-Type/WATER/Level 2/ATK 1200/DEF 0). (This card is NOT treated as a Trap Card.) If Summoned this way, this card is unaffected by monster effects, also banish it when it leaves the field.

Reckless Greed

Draw 2 cards and skip your next 2 Draw Phases.

Rise to Full Height

Target 1 face-up monster on the field; double its DEF, but its DEF becomes 0 at the end of this turn. You can banish this card from your GY, then target 1 monster you control; your opponent's monsters cannot attack for the rest of this turn, except to attack that monster. You can only activate 1 "Rise to Full Height" per turn.

Solemn Strike

When a monster(s) would be Special Summoned, or a monster effect is activated: Pay 1500 LP; negate the Summon or activation, and if you do, destroy that card.

Accesscode Talker

Cyberse/Link/Effect

2+ Effect Monsters
Your opponent cannot activate cards or effects in response to this card's effect activations. If this card is Link Summoned: You can target 1 Link Monster that was used as material for its Link Summon; this card gains ATK equal to that monster's Link Rating x 1000. You can banish 1 Link Monster from your field or GY; destroy 1 card your opponent controls, also for the rest of this turn, you cannot banish monsters with that same Attribute to activate this effect of "Accesscode Talker".

Knightmare Phoenix

Fiend/Link/Effect

2 monsters with different names
If this card is Link Summoned: You can discard 1 card, then target 1 Spell/Trap your opponent controls; destroy it, then, if this card was co-linked when this effect was activated, you can draw 1 card. You can only use this effect of "Knightmare Phoenix" once per turn. Co-linked monsters you control cannot be destroyed by battle.

Knightmare Unicorn

Fiend/Link/Effect

2+ monsters with different names
If this card is Link Summoned: You can discard 1 card, then target 1 card on the field; shuffle it into the Deck, then if this card was co-linked when this effect was activated, you can draw 1 card. You can only use this effect of "Knightmare Unicorn" once per turn. While a co-linked "Knightmare" monster(s) is on the field, draw cards equal to the number of those monsters with different names instead of 1 for your normal draw during your Draw Phase.

Linkuriboh

Cyberse/Link/Effect

1 Level 1 Monster
When an opponent's monster declares an attack: You can Tribute this card; change that opponent's monster's ATK to 0, until the end of this turn. If this card is in your GY (Quick Effect): You can Tribute 1 Level 1 monster; Special Summon this card. You can only use this effect of "Linkuriboh" once per turn.

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.

Paleozoic Cambroraster

Aqua/Link/Effect

2 "Paleozoic" monsters
Unaffected by other monsters' effects. You can only use each of the following effects of "Paleozoic Cambroraster" once per turn. You can target 1 Set card in the Spell & Trap Zone; send it to the GY, and if you do, Set 1 "Paleozoic" Trap directly from your Deck. It can be activated this turn. If a Set card(s) you control would be destroyed by card effect, you can banish this card from your field or GY instead.

Cat Shark

/Xyz/Effect

2 Level 2 monsters
While this card has an Xyz Material attached that was originally WATER, it cannot be destroyed by battle. Once per turn, during either player's turn: You can detach 1 Xyz Material from this card, then target 1 Rank 4 or lower Xyz Monster you control; its ATK and DEF each become double its original ATK and DEF until the end of this turn.

Downerd Magician

Spellcaster/Xyz/Effect

2 Level 4 Spellcaster-Type monsters
During your Main Phase 2, you can also Xyz Summon this card by using a Rank 3 or lower Xyz Monster you control as the Xyz Material. (Xyz Materials attached to that monster also become Xyz Materials on this card.) This card gains 200 ATK for each Xyz Material attached to it. If this card attacks a Defense Position monster, inflict piercing battle damage to your opponent. If this card attacks or is attacked, after damage calculation: Detach 1 Xyz Material from this card.

Paleozoic Anomalocaris

Aqua/Xyz/Effect

3 or more Level 2 monsters
This card is unaffected by other monsters' effects. Once per turn, if a Trap Card(s) is sent from your Spell & Trap Zone to the Graveyard (except during the Damage Step): You can excavate the top card of your Deck, and if it is a Trap Card, add it to your hand. Otherwise, send it to the Graveyard. Once per turn, during either player's turn, if this card has a Trap Card as Xyz Material: You can detach 1 Xyz Material from this card, then target 1 card on the field; destroy it.

Paleozoic Opabinia

Aqua/Xyz/Effect

2 Level 2 monsters
This card is unaffected by other monsters' effects. You can activate "Paleozoic" Trap Cards from your hand. If this card has a Trap Card as Xyz Material: You can detach 1 Xyz Material from this card; add 1 "Paleozoic" Trap Card from your Deck to your hand. You can only use this effect of "Paleozoic Opabinia" once per turn.

Sky Cavalry Centaurea

Beast-Warrior/Xyz/Effect

2 Level 2 monsters
This card cannot be destroyed by battle while it has Xyz Material. At the end of the Damage Step, if this card battled an opponent's monster: You can detach 1 Xyz Material from this card; return the opponent's monster from the field to the hand.

Toadally Awesome

Aqua/Xyz/Effect

2 Level 2 Aqua-Type monsters
Once per turn, during the Standby Phase: You can detach 1 Xyz Material from this card; Special Summon 1 "Frog" monster from your Deck. Once per turn, during either player's turn, when your opponent activates a Spell/Trap Card, or monster effect: You can send 1 Aqua-Type monster from your hand or face-up from your field to the Graveyard; negate the activation, and if you do, destroy that card, then you can Set it to your field. If this card is sent to the Graveyard: You can target 1 WATER monster in your Graveyard; add it to your hand.