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306.7. If noncombat damage would be dealt to a player by a source controlled by an opponent, thatopponent may have that source deal that damage to a planeswalker the first player controls instead.This is a redirection effect (see rule 614.9) and is subject to the normal rules for orderingreplacement effects (see rule 616). The opponent chooses whether to redirect the damage as theredirection effect is applied.