Svogthos, the Restless Tomb [Duel Decks: Izzet vs. Golgari]

T: Add C.
3BG: Until end of turn, Svogthos, the Restless Tomb becomes a black and green Plant Zombie creature with "This creature's power and toughness are each equal to the number of creature cards in your graveyard." It's still a land.