808.4 To determine which player goes first, randomly choose a team. If that team has an odd number of players, the player in its center seat goes first. If that team has an even number of players, the player to the left of its midpoint goes first. Turn order goes to the players’ left.
808.5 In the Team vs. Team variant, a team’s resources (cards in hand, mana, and so on) are not shared. Teammates may review each other’s hands and discuss strategies at any time. Teammates can’t manipulate each other’s cards or permanents.