My only criticism is that we also need enemy information so that we can use it to our advantage. How can I use Evil to the max if I can't tell how much health the enemy has left?
Hovering over enemy units does give you their hp in percentage; though you'll have to estimate whether Evil will kill or not (ie she can kill hunters at 100% but won't kill tanks over 50% unless you have a buff like capital bombardment or twins active).
