Urza, Lord Protector
From The Brothers' War set
Urza, Lord Protector
Legendary Creature — Human Artificer
2/4
Artifact, instant, and sorcery spells you cast cost
less to cast.
: 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.