Colossus of Akros is a rare Artifact Creature — Golem card from Theros (THS), collector number 214. Current market price: $1.88 (foil $3.25), TCGplayer market prices via Scryfall.
Defender, indestructible {10}: Monstrosity 10. (If this creature isn't monstrous, put ten +1/+1 counters on it and it becomes monstrous.) As long as this creature is monstrous, it has trample and can attack as though it didn't have defender.