I'm trying to make a list of cards for which Maze of Mirrors actually provides a beneficial effect when it changes "Villain" to "Hero".
To get us started:
Drawn to the Flame: Many villains have very few ongoing cards. The heroes, however, are swimming in them. You might get 5 or more points of damage to all non-hero targets with this power, which is a win even with the damage being redirected into your face.
Updated Intel: Rarely do more than one or two villain cards enter play in a round. Hero cards on the other hand, are entering play all the time. Lots of triggers!
Ammo Drop: If the villain keeps destroying your stuff, replace it with Ammo Drop! Also, it combos well with Omnicannon (although I recommend doing some other damage first, or the Omnicannon attack will be redirected back at Bunker.