Now that Soraka lost her mana infusion, give it to Ryze.
It was a unique and usefull ability. It's sad to see it gone from the game.
Ryze is already all about the magic so it would fit his character well.
Both his Q and W have technical room for an "on ally cast" option.
It wouldn't affect his laning at all, but it would make him a better choice for support. However since he has no heal, it would not bring back the problem of dual sustain.