[Spell] How to Edit Mirror Image

[Gatheinnnnnnnnnnnn]

So i have this idea where a unit uses mirror image but the mirror images are invisible but i don't if it is even possible. If it is possible someone please tell me how to do it.

Thanks in advance

 

[jonhysone]

You can trigger it, and when the X number of units are created you use Unit - Make Invisible or something like that, or add to them the ability to hide and make them cast it.