What is the correct step-by-step sequence for game setup in Riftbound?

Ruling: The correct game setup sequence is: (1) Reveal Legend, (2) Reveal Champion, (3) Choose and Reveal Battlefields, (4) Determine turn order (randomly determined player for game 1, or loser of previous game can decide if they go 1st or 2nd), (5) Draw 4 and resolve mulligans.

Sequence:

• Reveal Legend
• Reveal Champion
• Choose and Reveal Battlefields
• Determine turn order (randomly for game 1, loser chooses in subsequent games)
• Draw 4 cards and resolve mulligans in turn order

Nuances:

• There is no problem with both players using identical battlefields
• The Chosen Champion must be registered as part of your deck list before the tournament and cannot be selected on the fly during game 1
• You can change your Chosen Champion during sideboarding between games to one from your sideboard or main deck that matches your Legend
• You cannot side out your Legend
• Turn order is determined after battlefields are revealed, not before