Make some Prerequisite Statistic to be Able to Play Certain Champs in Ranked

Make it so that, in order to be able to play a specific champion in Ranked, you have to have X amount of Mastery on it (NOT to be confused with the actual upcoming Champion Mastery, which would have no such impact).

• This Mastery would be weighted by actions taken and performance in-game, not just winning while as that champion.

• ALSO Players must have sufficient mastery in at least one champion within each champion Attribute (Tank, Support, Fighter, etc...) to play Ranked (would not apply to the upcoming Ranked Team Builder).

• "Oh no, the champions I have Mastery in got banned/picked out!" The Champion Select would end instantly with little to no penalty to that player(s), as if they had dodged except with no LP lost (may bump up to low LP losses if you keep having bad luck in Champ Select, just to drive home that you may need more experience).

• Being reported as Unskilled in consecutive games, with proper evidence to validate the reports other than raging teammates, would lower this Mastery.

• Mastery can be built back up in Normals, or even Bots if it's really low (at a certain level, one would no longer be able to grind Bots)

• "But won't we just be in and out of Champ Select all day, never getting into a game because all the champions we know keep getting banned or picked?" The idea would be that you would have to have proved that you can play well in order to use that champion competitively, and that you should be able to at least passably cover any position. Maybe, if the system proves too stifling, it could be altered to allow use of champions with similar kits, or a less stringent Mastery requirement.