Metalwork Colossus is a rare Artifact Creature — Construct card from Kaladesh Promos (PKLD), collector number 222s. Current market price: — (foil $9.44), 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.