In Bo1 (Best of 1) Riftbound, can you swap your chosen Champion between games if there is no sideboard or deck registration required?

Ruling: If the tournament requires deck registration, you cannot change your chosen Champion since it is part of the registration. In casual tournaments without deck registration requirements, the tournament may not enforce using the same deck for each game.

Nuances:

• The ability to swap Champions depends on tournament structure and registration requirements, not solely on whether a sideboard is being used
• Casual tournaments may have more flexibility regarding deck consistency between games