Assassins are your hardest match-ups, particularly mobile ones that get on you easily like
, also
is surprisingly ap damage resistant.
Avoid fiddles if he get into your games (not ban worthy) I legit had to ban him any time I wanted to play Asol in Blitz, so bloody irritating that bouncing silence. Honestly high CC comps are painful as it disables your stars which is nearly all your damage.
If you don't already know how, google the position used to hit all minions in a mid wave, very important for having mana for efficient roaming, hes mainly a roaming champion so you should look out for extended lanes to gank particularly bot or where your jungles is currently ganking.
I don't play much summoner rift so I can't think of anything else usefull. Good luck Booping them back into the stone-age.
Here's a neat insec trick you can do with your ult, its so satisfying ulting enemies into your turret.
https://www.youtube.com/watch?v=Qd9sPU9VtGY