In Best of 3, do you pick battlefield at random for game 1, then choose for games 2 and 3?

Ruling: In Best of 3, you do not pick at random for any game. You pick a battlefield from the 3 you registered with your deck for all games based on what your opponent presents.

Sequence:

• Game 1: Pick a battlefield from your registered 3 based on opponent's legend and CC
• Game 2: Pick a battlefield from your registered 3 (cannot reuse one already played this match)
• Game 3: Pick a battlefield from your registered 3 (cannot reuse one already played this match)

Nuances:

• Random battlefield selection is only for Best of 1 game modes
• You cannot play a battlefield you've already played earlier in the same match