Eventually, of course, he made an appearance on a card: Mind Over Matter, from Exodus.
The next block was Urza's Saga, so it's no surprise that Urza's appearances ramped up a bit. Since then, he's appeared on many cards. Sometimes he's been Blind Seer, and one time he was a Legacy Weapon. Since his story spans thousands of years, it's not surprising that he sometimes looks a little different. Here's some of our favorite Urza cameos.
Urza Vanguard Card | Art by Mark Tedin