Urza, Founder of Tolaria

Affinity for artifacts
Metalcraft-{4}{u}{t}: Create a 1/1 colorless artifact creature servo token with: When this creature enters the battlefield, you may have it become a copy of another target artifact.
Metalcraft{t}: Add{3}. Spend this mana only to cast artifact spells
Metalcraft{3}{u}{t}: Search your deck for an artifact, reveal it, and put it into your hand.