Deluge of Doom [Duskmourn: House of Horror Commander]

Set: Duskmourn: House of Horror Commander Type: Sorcery Rarity: Rare Cost: {2}{B} All creatures get -X/-X until end of turn, where X is the number of card types among cards in your graveyard. "I told you there were no razorkin down that passage. I never said it was safe." —Winter