"Winrates determine how a champion is preforming"...
And generally low winrate champs get buffed right?
Well, out of all the lowest winrates in the game, two champion in their respective roles have a winrate of 44%. They are Azir and Veigar. Azir is getting reworked supposedly because he's too difficult to play, which justifies the low number.
Veigar on the other hand? Just flat out a shit champion right now. Maybe he needs to be looked at.