Kassadin used to get a powerspike at 6. since it was the only way he can close the gap to ranged champs. so many unnecessary nerfs with his W E AND A LACK luster Q. now i know kassadin is an "anti mage" but other champs focus as better anti mages and kass has nothing that makes him stands out besides his ult. Diana Ekko are examples build abyssal Sept and you automatically win against all aps

Kassadin channel interruption is useless unless against champs like galio etc riot he needs help just like sona and aatrox and zyra