Darklord Zerato (BP02-EN060) - Battle Pack 2: War of the Giants 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. During the End Phase, if this card activated this effect this turn: Destroy this card.