Curse of Shallow Graves 2HG

810.7a Each team’s creatures attack the other team as a group. During the combat phase, the active team is the attacking team and each player on the active team is an attacking player. Likewise, the nonactive team is the defending team and each player on the nonactive team is a defending player.

810.7c As the declare attackers step begins, the active team declares attackers. If an effect of an object controlled by a defending player prohibits a creature from attacking him or her, that creature can’t attack the defending team. The active team has one combined attack, and that set of attacking creatures must be legal as a whole. See rule 508.1.

Example: One player in a Two-Headed Giant game controls Teferi’s Moat, which says “As Teferi’s Moat enters the battlefield, choose a color.” and “Creatures of the chosen color without flying can’t attack you.” Creatures of the chosen color without flying can’t attack that player’s team.

810.7b Any one-shot effect that refers to the “defending player” refers to one specific defending player, not to both of the defending players. The controller of the effect chooses which one the spell or ability refers to at the time the effect is applied. The same is true for any one-shot effect that refers to the “attacking player.”

Any characteristic-defining ability that refers to the “defending player” refers to one specific defending player, not to both of the defending players. The controller of the object with the characteristic-defining ability chooses which one the ability refers to at the time the nonactive players become defending players. If that time has already occurred, that player makes that choice as the object enters the battlefield or gains the ability.

All other cases in which the “defending player” is referred to actually refer to both defending players. If the reference involves a positive comparison (such as asking whether the defending player controls an Island) or a relative comparison (such as asking whether you control more creatures than the defending player), it gets only one answer. This answer is “yes” if either defending player in the comparison would return a “yes” answer if compared individually. If the reference involves a negative comparison (such as asking whether the defending player controls no black permanents), it also gets only one answer. This answer is “yes” if performing the analogous positive comparison would return a “no” answer. The same is true for all other cases that refer to the “attacking player.”