Zed rework idea

I have an idea about the zed rework about to take place. I don't find a problem with the gender, that's irrelevant to gameplay. The ultimate though; my idea is to make the ultimate last longer but instead of one time damage pop you make each damage taken to activate a delayed shadow of that same ability ( maybe a 0.5 second delay) causing a portion of that damage. So instead of stacking damage, a shadow actually appears and deals damage after zed, only lowered. Maybe in magic damage(Kayn passive style?). Ideas?