Unfortunately I'm pretty sure the "Spell bound" passive on the illusions is impossible to code without a major re-write of the way the game is put together. There is no easy way to make a link between two (or more) cards on the field.
I know this because the original idea for voodoo doll worked this way, but zanz had to change it when he put it in the game because it couldn't be coded according to the original idea.
Fireflies and Firefly Queens work fine that way.
