The number of targets must be at least 1 and at most 3. You divide the damage as you cast Fire at Will, not as it resolves. Each target must be assigned at least 1 damage.
01-08-2008
wotc
You may target both attacking creatures and blocking creatures as you cast Fire at Will.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.