In a best-of-3 match with decklists, do you have to designate a specific battlefield for game 1, or can you choose from your registered battlefields after seeing the opponent's champion?

Ruling: You do not have to designate a specific battlefield for game 1. Battlefields are registered as a group, and you select which one to use after legends and command centers are revealed, allowing you to counter-pick even in game 1.

Sequence:

• Legends and command centers are revealed
• Battlefield is selected from your registered group

Nuances:

• A chosen champion is an element of deck construction and cannot be swapped in game 1, even when decklists are not in use