Historical Rules · 29 September 2017
Rule 801.5a
Official source text from the 29 September 2017 Rules release
If a player is asked to choose an object or player, he or she must choose one within his or her range of influence. Example: In a game with a range of influence of 1, Alex is seated to the left of Rob. Alex activates the ability of Cuombajj Witches, which reads, “Cuombajj Witches deals 1 damage to target creature or player and 1 damage to target creature or player of an opponent’s choice,” targeting Rob and choosing Rob as the opponent who picks the other target. Rob must choose a target that’s in both his range of influence and in the range of influence of the controller of Cuombajj Witches. He must therefore choose himself, Alex, or a creature controlled by either himself or Alex.