Activate Plundering Pirate by paying {1}{U}, blinking it.
When Plundering Pirate enters, it and Deadeye Navigator's soulbond ability trigger twice.
Resolve both Deadeye Navigator triggers, repairing it and Plundering Pirate.
Resolve both Plundering Pirate triggers, creating two Treasure tokens.
Activate both Treasures by tapping and sacrificing them, adding {1}{U}.
Repeat.

Infinite LTB

Infinite ETB

Deadeye Navigator

Panharmonicon

Plundering Pirate

Activate Plundering Pirate by paying {1}{U}, blinking it.
When Plundering Pirate enters, it and Deadeye Navigator's soulbond ability trigger
Resolve the Deadeye Navigator trigger, repairing it and Plundering Pirate.
Resolve the Plundering Pirate trigger, creating two Treasure tokens.
Activate both Treasures by tapping and sacrificing them, adding {1}{U}.
Repeat.

Xorn

Activate Emiel the Blessed by paying {1}, blinking Plundering Pirate.
When Plundering Pirate enters the battlefield, it triggers, creating a Treasure artifact token.
Activate the Treasure by tapping and sacrificing it, adding {1}.
Repeat.

Emiel the Blessed

Zirda, the Dawnwaker

Activate Emiel the Blessed by paying {3}, blinking Plundering Pirate.
When Plundering Pirate enters the battlefield, it triggers once, and Preston triggers twice.
Resolve the Plundering Pirate trigger, creating a Treasure token.
Resolve the first Preston trigger, creating a token copy of Plundering Pirate that is a 0/1 Illusion.
When the Plundering Pirate token enters the battlefield, it triggers, creating a Treasure token.
Repeat from step 4 for the remaining Preston trigger.
Activate three Treasures by tapping and sacrificing them, adding {3}.
Repeat.

Combos with "Plundering Pirate"