Seems dumb.
Can't make a tier list for league because each region has different overall meta playstyles.
Has to be specific to a certain elo and region. Not to mention then you have to make an entire seperate tier list for championships like LCS and Worlds.
I can see why people downvoted this because they think this is "Overall" which I can see since it wasn't specified.
But it's just a waste of time. You're better off just personally looking at win rates per patch, per elo for your region or kr since they're heavily change per patch. Even on patches where only 3 champs got tweaked by 5 AD can create chain effects.