Detecting Mirror Images

Okay. I basically want mirror image to cast, and then I want to remove the mirror images.

Problem: Mirrors are same unit-type as caster, don't count as "summoned," and I don't know of any way to detect buffs on a unit. In fact, I don't even know why Blizz included a buff comparison since they didn't give it any functions.

Any help?

Edited because: Nevermind. I just didn't think to check booleans. I guess there's no way to delete this. .