Jaws of Stone
Duel Decks: Knights vs. Dragons — uncommon
Sorcery
Jaws of Stone rulings:
2008-05-01: 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.
2008-05-01: If you control no Mountains as you cast Jaws of Stone, the number of targets must be zero.
2008-05-01: You divide the damage among the targets as you cast Jaws of Stone. Each target must be assigned at least 1 damage.