"Aleister the Invoker" + 1 WATER monster Cannot be destroyed by your opponent's card effects. Your opponent cannot target this card with card effects. This card can attack while in face-up Defense Position. If it does, apply its ATK for damage calculation.
Normal Summon Aleister the Invoker and search Invocation. Then use Invocation to banish Aleister and a WATER monster from either graveyard to make Invoked Cocytus. This summoning can be used to remove your opponent’s graveyard interactions.