For example, if the champion was an enemy jungling. He/she could disguise as your jungler and you lose vision of your own jungler for 3 seconds but have complete vision of the the disguised one; however they have unique traits that set them apart from the allied jungler. derp
I've thought about a champ that does that a few times. It seems really complex, but seems doable.
The problem with this kind of ability is that it would exist solely to create frustrations in uncoordinated teams while being completely useless against anyone that has some kind of communication going on.
Disguising as an allied champion might be a more feasible version of the skill, though ultimately I'm not sure you could really do much advantageous with such an ability that wouldn't actually be 100% useless against players who understood what that champion did.
