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

Infinite LTB

Infinite ETB

Deadeye Navigator

Panharmonicon

Swashbuckler Extraordinaire

Activate Swashbuckler Extraordinaire by paying {1}{U}, blinking it.
When Swashbuckler Extraordinaire enters, it and Deadeye Navigator's soulbond ability trigger
Resolve the Deadeye Navigator trigger, repairing it and Swashbuckler Extraordinaire.
Resolve the Swashbuckler Extraordinaire 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 Swashbuckler Extraordinaire.
When Swashbuckler Extraordinaire enters the battlefield, it triggers, creating a Treasure artifact token.
Activate the Treasure by tapping and sacrificing it, adding {1}.
Repeat.

Emiel the Blessed

Agatha of the Vile Cauldron

Activate Emiel the Blessed by paying {3}, blinking Swashbuckler Extraordinaire.
When Swashbuckler Extraordinaire enters the battlefield, it triggers twice, and Preston trigger twice if it has power 2 or less, or once otherwise.
Resolve both Swashbuckler Extraordinaire triggers, creating two Treasure artifact tokens.
Resolve the first Preston trigger, creating a token copy of Swashbuckler Extraordinaire that is a 0/1 Illusion.
When the Swashbuckler Extraordinaire token enters the battlefield, it triggers twice, creating two Treasure tokens.
Repeat from step 4 for the remaining Preston trigger, if applicable.
Activate three Treasures by tapping and sacrificing them, adding {3}.
Repeat.

Combos with "Swashbuckler Extraordinaire"