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As an additional cost to cast this spell, sacrifice an artifact or creature with mana value X.
Nahiri's Sacrifice deals X damage divided as you choose among any number of target creatures.
If some of the targets of the last ability become illegal, the original division of damage still applies, but the damage that would have been dealt to illegal targets isn't dealt at all.
You can't choose more than X targets, and each chosen target must receive at least 1 damage.
You choose the value of X, the targets, and how damage will be divided as you cast Nahiri's Sacrifice.
