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Doomskar

Doomskar

{3}{W}{W}
SorceryPKHMrare

Destroy all creatures.

Foretell {1}{W}{W} (During your turn, you may pay {2} and exile this card from your hand face down. Cast it on a later turn for its foretell cost.)

Rulings3

2013-09-15If some but not all of Boulderfall's targets become illegal, you can't change the division of damage. Damage that would have been dealt to illegal targets simply isn't dealt.
2013-09-15If an effect creates a copy of Boulderfall, the division of damage and number of targets can't be changed. The effect that creates the copy may allow you to change targets, however.
2013-09-15You divide the damage as you cast the spell, not as it resolves. Each target must be assigned at least 1 damage.