If I read ONE MORE TIME:
I think you should require Lv.4 mastery on a champ to use them in ranked.
I'm going crazy! [zombie-brand-facepalm]
That's not even close to sanity!
I a 3200 Hours, thousands of Rankeds and Normals, Diamond Player - would BARELY be able to play freaking Ranked once the 10 Ban System hits life because that would require 20 Level 4 Champions while I have 21!
Assuming 1000 Points per win... that would require 260 wins = 520 games! **And that ONLY If you don't touch a single Champion outside of that 20 AND don't play a single game on any Champion with Mastery 4 obtained! **
So It's kinda save to assume at least 1000 normals before you can think about playing a single game Ranked! Hilarious!
Counterpicks? Dead! Autofilled and your only JGL Picked? Guess It's time for Aurelion JGL!