Sejuani Jungle
I had a teammate qq about me not banning Sejuani when it seemed like the other team was making a comeback but failed to realize that the Sej's in this elo would throw an ult to kill one person(actually in every elo) rather than using it to chain-cc a 5 man ace.
I think I've only lost one game against a Sejuani jungle out of like 20 games. To me it's a wasted ban especially when there's more annoying champions that are worlds easier to play.