i didnt play for some time but good jhin is always a big problem especially on lower ranks, you cant touch him, he kites like crazy he is fast and has big burst, overall great for smurfing and not only that
If you have good skills on midlane and know how to remember spells well, just play Hwei you'll understand soon with Ausol and Ahri nerf hwei winrate is going to skyrocket
tristana mid is long time strong, corki has more magic damage which is good in mid plus poke, both champs great to climb faster, downside is you dont have cc so vision/map awareness is key when you want to pressure and push towers, its not like noobie ahri that almost always escapes no matter what happens ;D