Activate Galazeth Prismari by paying 1, blinking it.
When Galazeth Prismari enters the battlefield, it and Deadeye Navigator's soulbond ability trigger.
Resolve the Deadeye Navigator trigger, repairing it and Galazeth Prismari.
Resolve the Galazeth Prismari, creating two Treasure artifact tokens.
Activate the Treasures by tapping and sacrificing them, adding 1.
Repeat.
This clever loop transforms Deadeye Navigator and Galazeth Prismari into a self-sustaining blinking engine, anchored by the soulbond partnership that grants the elemental dragon its repeatable exile-and-return ability. Every time Galazeth Prismari blinks back onto the battlefield, its entry trigger generates a Treasure token, which Xorn generously amplifies by adding an extra token to the haul. Those resulting Treasures are then put to work thanks to Galazeth Prismari's static ability, which lets you tap them for the exact colored mana needed to pay for Deadeye Navigator's blink activation, leaving you with infinite value and a mountain of spare artifacts.