Casey & Raph by paying ({1} magic symbol) ({U} magic symbol) , blinking it.
When
Casey & Raph enters, it and
Deadeye Navigator's soulbond ability trigger.
Resolve the
Casey & Raph trigger, creating two Treasure tokens.
Resolve the
Deadeye Navigator trigger, repairing it and
Casey & Raph.
Activate the Treasures by tapping and sacrificing them, adding ({1} magic symbol) ({U} magic symbol) .
Repeat.
Notes
You can optionally have an opponent exile the top card of their library in step 3 using
Casey & Raph's other mode. This does allow them to cast it for free, which may allow them access to pieces that will disrupt the combo (such as a removal spell).