Tip
Kassadin is weak early game and has an extremely short range, so simply punish him while staying outside his (Q)’s range. If Kassadin uses (R) to close in post-level 6, use [R] to push him under turret to trade.
Azir vs Kassadin

Kassadin is weak early game and has an extremely short range, so simply punish him while staying outside his (Q)’s range. If Kassadin uses (R) to close in post-level 6, use [R] to push him under turret to trade.