Svogthos, the Restless Tomb is a uncommon Land card from Ravnica: City of Guilds (RAV), collector number 283. Current market price: $0.22 (foil $2.41), 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.