Metalwork Colossus is a rare Artifact Creature — Construct card from Kaladesh (KLD), collector number 222. Current market price: $1.06 (foil $1.63), TCGplayer market prices via Scryfall.
This spell costs {X} less to cast, where X is the total mana value of noncreature artifacts you control. Sacrifice two artifacts: Return this card from your graveyard to your hand.