How to make an illusion cast an ability

[HIGH_WAR_LORD]

Im trying to make an ability that makes illusions ( mirror image ) to cast bladestorm with the level off the bladestorm of the caster

 

[Daffa]

Simulate the entire illusion. As ugly as it gets, it makes additional heroes at the screen while they're existent, but this way they can use spells.

OR

Trigger the entire bladestorm.

 

[XiiaOYanG12]

Try making a extra unit that look alike your Hero and add bladestorm to it? after that autocast the ability via trigger

 

[Athur12A2]

Pause illusion unit, play its spin animation, and custom the damage

 

[Jampion]

I made a map and triggered the bladestorm for the illusions. It's not MUI and leaks, but it shows how you could do it.