This champion is way too save to play. You can't gank him, he'll just instant stun + slow you. He can bomb you all day from infinite range and never run out of mana thanks to his passive, and when you try to shut him down with a gank, he just stuns your jungler and laughs. He has no draw backs. No weaknesses.
Make his stun a set up like Brand. Or get rid of the stun and leave it as just damage. Give this champion a reason to play safe. He can bully anyone he wants and there is nothing you can do about it. That is way too much power.