
Sorcery
Volcanic Wind deals X damage divided as you choose among any number of target creatures, where X is the number of creatures on the battlefield as you cast this spell.
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The value of X is determined at the time you announce this spell, and you choose the targets and the division of damage among those targets as part of the announcement as well.
If there are no creatures on the battlefield when you cast this, you do not pick any targets and it deals no damage.