What is the correct order for choosing battlefields, revealing battlefields, and choosing to go first or second in a Bo3 match?

Ruling: The order is the same for every game: Legend > Chosen Champion > Battlefields chosen and revealed > Turn order > Draw & Mulligan. Battlefields are revealed before determining turn order.

Sequence:

• Legend selection
• Chosen Champion selection
• Battlefields chosen and revealed simultaneously
• Turn order determined
• Draw 4 cards
• Mulligan

Nuances:

• In games 2 and 3 of a Bo3, the player who lost the previous game makes the choice for play/channel after seeing battlefields
• Both players can use the same battlefield
• Sideboarding happens before everything (before Legend selection) and players do not need to disclose how many cards they're swapping