Colossus Hammer is a uncommon Artifact — Equipment card from Core Set 2020 (M20), collector number 223. Current market price: $1.87 (foil $9.86), TCGplayer market prices via Scryfall.
Equipped creature gets +10/+10 and loses flying. Equip {8} ({8}: Attach to target creature you control. Equip only as a sorcery.)