§ 486.5 Core Rules PDF (officieel)

Setup: Each player selects one (1) of their three (3) Battlefields. The other two are set aside and will not be used for this round of play. The selected Battlefields are placed simultaneously in the Battlefield Zone. After this game, if a player won, the Battlefields that were used are to be removed and not selected again for this Match. One of the remaining Battlefields that were set aside must be chosen instead.