Revendread Slayer (COTD-EN082) - Code of the Duelist Unlimited

You can Ritual Summon this card with any "Vendread" Ritual Spell. Once per battle, if this card battles an opponent's monster, during damage calculation (Quick Effect): You can banish 1 Zombie monster from your GY; this card gains 300 ATK. If this Ritual Summoned card is sent to the GY: You can add 1 Ritual Spell from your Deck to your hand, and if you do, send 1 "Vendread" monster from your Deck to the GY. You can only use this effect of "Revendread Slayer" once per turn.