Champions in Ranked

Hey Riot, How about if u want to play a Champion in Ranked u have aleast win 10 Games in Normal with this Champion. I have so many Games lost cuz of ppl pick a first time Champion and cant even play him , than they start feeding and runied my Game. This would solve many ppl problem, cuz those kids are annoying as hell. If some1 say , its bad cuz Pro Player have no time to win 10 Games on every Champion what they wanne play. Yes maybe u right but even Pro Player have the time for that. Would love to hear what u think about this Idea.
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