Kassadin needs some changes and give him a new skin
Seriously, his kit is very basic and he has no control over his E (maybe make his Q a skillshot to introduce more counterplay? ). Also, what's up with that MR per level? It's like having no passive. Also, his damage is lower than other assassins and takes forever to scale when the games are decided in minute 10-15 and closed in minute 20-25 (or I play only vs tryhards... because it's rare to play 40minutes game - I miss season 4-5...).
His laning is also the weakest in the game. If you don't like him countering AP mages, change the passive.
And add a new skin.
