If there was (to make it fair, a super quick - like 2 seconds or something) AOE CC mages could cast, something akin to... a petting zoo?! Where every enemy in a certain range becomes polymorphed into something random, and maybe you could glyph to make them all turn into one thing, if you want... They could even change the mechanics and make it fun.. Say...
1 enemy in range - 30 seconds
2 enemies in range - 15 seconds...
like that.
Id just find it really funny. And the girl in me would SQUEAL with delight whenever I cast it.