Diregraf Colossus is a rare Creature — Zombie Giant card from Shadows over Innistrad (SOI), collector number 107. Current market price: $5.57 (foil $7.56), TCGplayer market prices via Scryfall.
This creature enters with a +1/+1 counter on it for each Zombie card in your graveyard. Whenever you cast a Zombie spell, create a tapped 2/2 black Zombie creature token.