Mermail Abyssleed (CBLZ-EN034)

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

Sea Serpent / Effect, Cosmo Blazer