Turn order is as follows: 1. The first team’s A player. 2. The second team’s A player. 3. The first team’s B player. 4. The second team’s B player. 5. Return to the top of the order.
§ 603.7.a Tournament Rules PDF (officieel)
§ 603 2v2
§ 603.7 During matches, teammates sit next to each other in their registered AB order. The setup process for a game of Riftbound is defined in the Core Rules, with these additional exceptions for 2v2: