Are you Man enough to rule the seas?
RD/KP07-JP003 イルカ王イルクァ Iruka Oh Iruqua (Dolphin King Iruqua)
Level 6 WATER Sea Serpent-Type Normal Monster
(A Dolphin that has braved the stormy seas and hardships of the world, throwing itself headfirst into learning the ways of royalty)
RD/KP07-JP021 カルイルカ Karuiruka
Level 2 WATER Sea Serpent-Type Effect Monster
[Requirement] If you control a face-up “Umi” or “Big Ocean”, you can activate this if you control a face-up Normal Monster (Fish-Type, Sea Serpent-Type, Thunder-Type, or Aqua-Type).
[Effect] Draw 1 card.
Note: カルイ can mean things from lightweight, nimble, agile, non-serious, gentle, simple, indiscriminate, so probably a multi-tier joke best not to throw one’s self at.
RD/KP07-JP045 シェイプ・オブ・アクア Shape of Aqua
Normal Spell Card
[Requirement] You can activate this by sending 1 Spell/Trap Card from your hand to the Graveyard.
[Effect] Choose 1 monster (Fish-Type, Sea Serpent-Type, Aqua-Type or Thunder-Type) in your Graveyard and Special Summon it face-up. The monster Special Summoned by this effect loses 800 ATK until the end of the turn.
RD/KP07-JP058 海豚反撃 Irucounter (Irucounter/Dolphin Counter)
Normal Trap Card
[Requirement] When an opponent’s monster attacks a face-up monster (Fish-Type or Sea Serpent-Type) you control, you can shuffle 1 “Umi” or “Big Ocean” from your Graveyard into the Deck.
[Effect] Choose and destroy the monster your opponent controls with the highest ATK. Draw 1 card, then reveal it. If that card is “Umi” or “Big Ocean”, also inflict 500 damage to your opponent.
RD/KP07-JP059 イルクァの荒波 Iruqua no Aranami (Seastorm of Iruqua)
Normal Trap Card
[Requirement] When your opponent’s monster declares a direct attack, you can activate this if you control a face-up “Umi” or “Big Ocean”.
[Effect] Change the battle positions of all face-up monsters your opponent controls (Attack Position changes to face-up Defense Position, Defense Position changes to face-up Attack Position). Then, choose 1 Normal Monster (Sea Serpent-Type) in your Graveyard and Special Summon it to your side of the field face-up.
Note: I feel like this might be a play on Windstorm of Etaqua, so I’m heading in that direction.