Crumbling Colossus is a uncommon Artifact Creature — Golem card from Magic 2012 (M12), collector number 204. Current market price: $0.05 (foil $0.18), TCGplayer market prices via Scryfall.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) When this creature attacks, sacrifice it at end of combat.