You shouldn't be allowed to try a champion for the first time in Ranked Matches

Basically as title say. It happened to me several time now. Now i don't want to be super strict on the rules or stuff like that, but it's not possible for people like me whoa re trying to get higher in the ranks (im working my butt off to get platinum honestly) to be matched with people that just don't care a try out a champion that they just bought.

I had a match with a Rengar that was at his first game with him. And it really showed in how he played, wrong engages, wrong build, died a ton, low impact on the game.

Needless to say we lost, too bad that was my promo.

So I don't want to be super strict as i said before, but i'd say that AT LEAST you should do 3 normals games with a new champion before trying him in ranked