When Urza enters the battlefield, it and Deadeye Navigator's soulbond ability trigger.
Resolve the Deadeye Navigator trigger, repairing it and Urza.
Resolve the Urza trigger, creating two 0/0 Construct artifact creature tokens.
Activate Urza's first ability twice by tapping the Constructs, adding .
Repeat.
This delightful loop turns Urza, Lord High Artificer into a self-sustaining engine by leveraging Deadeye Navigator's soulbond ability to repeatedly blink him. Each time Urza re-enters the battlefield, Primal Vigor doubles his entry trigger, flooding your board with twice as many Construct artifact creature tokens to fuel his mana-producing tap ability. By tapping those newly minted Constructs for blue mana, you easily pay for Deadeye Navigator's blinking cost while generating an endless parade of entries, leaves, and tapped token copies.