What is the correct sequence for battlefield selection and turn order determination at the start of a game?

Ruling: Players first select and reveal battlefields, then determine turn order (via dice roll/coinflip), then draw cards and mulligan.

Sequence:

• Select battlefields
• Roll dice/coinflip to determine who chooses turn order
• Reveal battlefields
• Choose turn order (who goes first/second)
• Draw cards and mulligan

Nuances:

• For tournaments requiring decklist submission, you cannot change your deck/sideboard after submission
• Sideboarding is only allowed between games in a best-of-three match (between game 1 and 2, and between game 2 and 3)
• Game 1 must always use the deck as submitted on the decklist