Jaws of Stone

Oracle Text

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.

Card Rulings

5/1/2008 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.
5/1/2008 If you control no Mountains as you cast Jaws of Stone, the number of targets must be zero.
5/1/2008 If you control any Mountains as you cast Jaws of Stone, the number of targets must be at least one and at most X. You divide the damage among the targets as you cast Jaws of Stone. Each target must be assigned at least 1 damage.