Text (PC+errata): 3/3. ; Flash. ; Madness {2}{B}. ; When ~this~ enters the battlefield, change the target of target spell that targets only a single creature to ~this~. [Oracle 2009/07/08]
The spell's target is changed only if this is a legal target for that spell. [Planar Chaos FAQ 2006/12/13]
If a spell targets multiple things, you cannot use this spell on it even if all the other targets have become illegal. [Planar Chaos FAQ 2006/12/13]
If a spell targets the same thing multiple times, you cannot use this spell on it. [Planar Chaos FAQ 2006/12/13]
