[Suggestion] New champion requirement for Ranked

Noticing a good hunk of losses, not just my own, revolves around a player deciding to try a new champion and feeding everyone. Obviously everyone on each team could've done better to result in a win, but we all know what most teammates will do as soon as someone feeds in any elo :'). So my suggestion is having a requirement of minimum 10-20 games played with the champion before it's eligible to be picked in ranked. This would combine with the minimum 13(?) base champions players need to even queue for ranked. Less feeding, less raging community, less punishments; would make the community look slightly better.