Text (SA): Change the target of target spell with a single target.
You choose the new target during resolution of this spell. If there are no legal targets at that time, you can't change the target. [Shards of Alara FAQ 2008/09/23]
This card targets the spell being changed. It does not directly affect the original target or the new target. [Shards of Alara FAQ 2008/09/23]
You cannot change a spell on the stack to target itself. [Shards of Alara FAQ 2008/09/23]
If a spell targets multiple things, you can't target it with Swerve, even if all but one target has become illegal, or if the same thing is targeted multiple times. [Shards of Alara FAQ 2008/09/23]
