Urza, Lord Protector is a mythic Legendary Creature — Human Artificer card from The Brothers' War (BRO), collector number 225. Current market price: $9.03 (foil $12.54), TCGplayer market prices via Scryfall.
Artifact, instant, and sorcery spells you cast cost {1} less to cast. {7}: If you both own and control Urza, Lord Protector and an artifact named The Mightstone and Weakstone, exile them, then meld them into Urza, Planeswalker. Activate only as a sorcery.