Perplexing Chimera

Perplexing Chimera

Enchantment Creature - Chimera | Power/Toughness: 3 / 3 (CMC 5)
Whenever an opponent casts a spell, you may exchange control of Perplexing Chimera and that spell. If you do, you may choose new targets for the spell. (If the spell becomes a permanent, you control that permanent.)