after nerfs lilia hecarim karthus are S+ tier.
lilia -
you go demonic into zhonya against hecarim/assasins and she's quite good imo. liandry 3rd
Xin zhao seems to me a good champion. his ult is now 5 seconds and it seems quite good
graves -
with graves its a specific playstyle which is powerfarm and play well for objectives.
K6/eve is A+ tier if your in lower elo and play it really well and understand how to farm efficient and and if you know how to be on right place at the right time
any questions feel free to ask on discord!