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Jaws of Stone deals X damage divided as you choose among any number of targets, where X is the number of Mountains you control as you cast this spell.
If you control no Mountains as you cast Jaws of Stone, the number of targets must be zero.
The amount of damage is locked in as you cast Jaws of Stone. It won’t change, even if the number of Mountains you control changes.
You divide the damage among the targets as you cast Jaws of Stone. Each target must be assigned at least 1 damage.
