How are battlefields chosen at the beginning of a game - randomly or by player choice? Can the same battlefield be used multiple times in a match?

Ruling: Each player brings three battlefields as part of their deck. In best-of-three matches, each player chooses which battlefield to use for each game but can only use each battlefield once per match. In best-of-one matches, battlefields are randomly chosen.

Sequence:

• Each player constructs a deck with three battlefields
• In BO3: Players choose their battlefield for each game
• In BO3: Each battlefield can only be used once across the three games
• In BO1: Battlefield is randomly selected

Nuances:

• The selection method differs based on match format (BO3 vs BO1)