Having an ability that you cast for 50 energy then it drains energy for it duration is simply a bad ability design. There is no reason Mirages 4th should be a Duration Eps ability Wu kongs original cloud walker was a duration/eps but after his buff its just duration.
If it was an activate EPS ability where u could have it on as long as you want that would be better
if it was a normal cast with duration and no eps that would be fine to.
Mirages 4th is not worth the combined 200 energy it drains, just make it cost 100 energy and and remove the eps.