What are these Sej nerfs on PBE?
Cinder was just nerfed, and I think she's only being banned out of habit at this point. Her winrate at diamond is only ~51%, which is a far cry from what it used to be. She's probably balanced right now, considering people likely aren't picking aggressive jungles that can take advantage of a Sej pick right now.
Those ratio changes are going to murder the champ.
Riot, wait for the damn meta to settle before you go on a nerfing spree.