Svogthos, the Restless Tomb is a uncommon Land card from Duel Decks: Izzet vs. Golgari (DDJ), collector number 81. Current market price: $0.21, TCGplayer market prices via Scryfall.
{T}: Add {C}. {3}{B}{G}: Until end of turn, this land 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.