Rule 471.1.a
In Modes of Play with teammates, Battlefields under the Control of a teammate during the scoring step of the Beginning Phase of a player’s turn are also disqualified from being Scored through Conquer by any means by that player’s team.
Loading Arbiter…
In Modes of Play with teammates, Battlefields under the Control of a teammate during the scoring step of the Beginning Phase of a player’s turn are also disqualified from being Scored through Conquer by any means by that player’s team.