Idea for no first time champions in ranked

I thought of an interesting idea, to reduce the amount of 1st-time champion picks in ranked. I think in order for you to play a champion in ranked you should have to have a mastery 2 on that champion via playing them in normals. This way the player will have some knowledge of the champion. This idea could be exclusive to certain elo's or have an account link option (both accounts need to verify) to still allow smurf as long as they have a mastery 2 on that champion on their main.
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