What the fuck even is Kassadin
Idk.
Just came out of a game we were about even the enemy was putting up a fight. (we had a sligth advantage). Minute 26 we siege their base with nashor and my Kassadin literally R E Q's their Yasuo to one shot him and then proceeds to repeat that 5 times and we won. I have never seen someone get one shot with that little counterplay. Their Zyra ate Kassa's R and empowered AA and instantly died before she could even root or Zhonyas. I know Kassadin is considered late game but all he had is 
and half of Lich bane.
Worst part is the entire enemy team just finished with a 'BG'. Felt like a cheated match.
with 
as his most usual choice for boots. This build takes so long to complete and have everything stacked that and pre 6 kassadin is a melee with no escape with a conditional aoe slow and a weak single target ability which equals to a very undwerwhelming laning phase thats its should punishable from every mid laner and a good gank choice from the jungle. Kassadin pre lv 16 has his R long cooldown and it easy to bait and punish him while his R is on cooldown. With all of that Kassadin needs tons of mana to spam R, needs lv 16 to be unstopable force, this tear plus RoA plus lichbane is expensive and needs time to stack. So weak early and mid -till all the stacking is done, needs 3 expensive items and lv 16 for max R cooldown. Thats literally his win condition, i mean your enemies had at least 20-25 mins to make sure that kassadin is behind or get themselves a lead and end it fast but they didnt. that THEIR fault for not having a better game plan or executing it badly that end up leaving a kassadin to get into his final form.
is always a win. Best thing to do against him is to spam gank pre-6 to slow down his building of 