To which part of my comment are you referring? I hope not all of it, because this would be a very poor job of addressing my points.
As for the damage, I addressed that. I believe he gets extra damage due to his passive and the items available to supports. This could be nerfed (via passive interaction with spellthief's) if it is in fact too powerful. Also, you should be able to tell when he's trying to get that damage off. It's easy to avoid the 3rd stack of passive because it takes 3 abilities to set it off.
As for cc, he has one single target skillshot stun. If you can't juke that then you're either too close or your reaction speed needs work. It's your job to respect zones of control and position safely in lane. It's not the champion's fault for being effective against you when you don't do that properly.