Mercadian Masques · MMQ · uncommon
Sorcery
wotc · 2004-10-04
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.
wotc · 2004-10-04
If there are no creatures on the battlefield when you cast this, you do not pick any targets and it deals no damage.