If you want to nerf an AP champ, why not Heimerdinger?
He honestly deserves it much more than Ryze did. You say Ryze has good poke, yet You can't get anywhere near Heimer with the ridiculous range his turret lasers have. He basically gets to shove the lane for free all day because his turrets NEVER die. Even after he dies his turrets are still up. Unlike things like Teemo shrooms and Shaco's boxes (which actually go away after a period of time), the turrets last forever. Honestly there isn't that much wrong with him. I just don't think it's fair that he can push for free all game, when other champs actually need to spend mana (and put themselves at risk) to cs. He can just sit behind his turrets all day, and they never die. And as I said, it's impossible to trade with him because of the turret laser range, and they block skillshots for him.