Urza's Legacy Unfolds. Urza Planeswalker has enlisted the most brilliant minds from across Dominaria to study at his academy on Tolaria. Together they work to bring to life the greatest artifact weapon Urza has ever devised, hoping to use it to defend their home from an imminent Phyrexian invasion. But treachery and tragedy stalk the tiny island, as Urza and his followers seek to manipulate time itself.