Fall of the Hammer

Oracle Text

Target creature you control deals damage equal to its power to another target creature.

Card Rulings

2/1/2014 As Fall of the Hammer tries to resolve, if only one of the targets is legal, Fall of the Hammer will still resolve but will have no effect: If the first target creature is illegal, it can’t deal damage to anything. If the second target creature is illegal, it can’t be dealt damage.
2/1/2014 The amount of damage dealt is based on the first target creature’s power as Fall of the Hammer resolves.