Darklord Zerato - BP02-EN060 Rare Unlimited

If you have 4 or more DARK monsters with different names in your Graveyard, you can Tribute Summon this card by Tributing 1 DARK monster. You can send 1 DARK monster from your hand to the Graveyard; destroy all monsters your opponent controls. Once per turn, during the End Phase, if this effect was activated this turn: Destroy this card.