The most powerful Planeswalker on Dominaria before the end of the Phyrexian invasion. (Apocalypse was the last set of
Magic: The Gathering cards before
Wizards of the Coast started a new storyline.)
The Argavian calender starts with the date of
Urza's birth.
Frequently refered to as 'Urza Planeswalker', he has had an effect on everyone in Dominaria's lives.
For more information.. Read the
Magic: the Gathering novels, starting with the first of four books of the Artifact Cycle, "The Brothers' War"
--NobleArc
"There were
worse things than death,
certainly, And so far, Urza Planeswalker seemed
capable of them all."