Urza, Chief Artificer is a mythic Legendary Creature — Human Artificer card from The Brothers' War Commander (BRC), collector number 49. Current market price: $7.00 (foil $10.74), TCGplayer market prices via Scryfall.
Affinity for artifact creatures (This spell costs {1} less to cast for each artifact creature you control.) Artifact creatures you control have menace. At the beginning of your end step, create a 0/0 colorless Construct artifact creature token with "This token gets +1/+1 for each artifact you control."