If any future buffs happen to Kassadin they should give his W a Max Mana to Damage ratio
To further promote actually going into Melee range and trading, aka allowing him to further optimize into tankier items like he already can do with his Ultimate.
If he has to be 450 range from someone instead of 700 to R them, allow him to get a lot of benefit from actually reaching you. Especially with how many Kass players pick up 