Kassadin is still Overpowered.

The other day I fought against a Kassadin in the mid lane. And guess what? the freak actually got a kill! All these recent nerfs are a step in the right direction, but Kassadin remains grossly overpowered. So here are my proposed nerfs:

Passive: Void Stone Kassadin takes 15% 5% reduced magic damage and~~ ignores unit collision~~. This ability makes Kassadin far too difficult to burst down. Nobody should be able to survive more than a couple hits by Katarina.

Q - Null Sphere COOLDOWN: 9 COOLDOWN: 45/40/35/30/25 Overall I like the idea of this skill, but he is able to this skill far too often.

E - Nether Blade ACTIVE: Kassadin charges his Nether Blade, causing his next basic attack to deal bonus magic damage, gain 50 range (200 total range) and restore a percentage of his missing mana (quintupled halved against champions). Nobody should be able to ignore their mana problem. Every single assassin must constantly deal with mana problems to survive, why shouldn't Kassadin?

W - Force Pulse PASSIVE: Kassadin draws energy from spells cast in his vicinity, gaining a charge whenever a spell is cast near him (including his own spells). Upon reaching 6 12 charges, Kassadin gains the ability to cast Force Pulse. Again, I think this skill shows potential, but he is far too effective in teamfights when it only takes 6 nearby skills to charge this ability.

R - Riftwalk COOLDOWN:~~ 7 / 5 / 3~~ 150/130/110 ACTIVE: Kassadin teleports to a nearby location, dealing ~~magic ~~ physical damage to enemy units within 150 20 range upon arrival. Each subsequent Riftwalk within the next 20 seconds costs double the mana and deals bonus damage, stacking up to 4 times. Why should any champion be allowed to use their ult every 3 seconds? It is time for Rito to stop playing favorites. Kassadin has gotten away with things no other assassin ever could, and I think this needs to end.