Mermail Abyssleed (SHVA-EN038) [Shadows in Valhalla]

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.