Can champion units in the Chosen Champion Zone be targeted by spells and abilities (such as Falling Star targeting Yasuo)?

Ruling: The Chosen Champion Zone is not part of the board. Spells and abilities cannot interact with champion units in the Chosen Champion Zone unless they explicitly state they can (like Teemo).

Nuances:

• Only effects that specifically mention they can interact with the Chosen Champion Zone are able to do so
• This differs from some other card games where commander zones may have different interaction rules