Rework Ranked champions system

Its come to my attention as well as just thinking bout a game play update like this, in order to play a champion in a ranked game, regardless of lvl or division, having any champion in question be lvl 4 mastery or higher to play.

With the release of Pike i see more and more people are just trying him out in ranked on the 1st try, which more than often leads to a lose in ranked, but ranked is to show off yur skills, not be like. "I'm going to try this new champion and see wut happens"

Changing ranked to be able to play with a lvl 4 or higher mastery would not only stop players form feeding or learning a new champion, in a game mode where its meant to show off the skills u have, but it would also stop and smurf's or feeders that are mad at the game/players and just feed , which destroys the game for others who are actually trying to play the game,

Hopefully someone see's this and either explains why this would be a good change or a bad idea, and helps with other ida's

https://matchhistory.na.leagueoflegends.com/en/#match-details/NA1/2800101488/209254888

this is wut games im talking bout, the riven is m7 and smurf'ed me team to lose the game, i was nasus vs rumble. easy-ish game to be had, and still riven and pike went afk thought the game, with an update to lvl 4 mastery to play ranked would solve all of these problems many players see in ranked