Minimum Champion Mastery Requirement for Ranked
I'm not a huge fan of this myself, .. but I think others might agree, especially with all of the concern with reworked champions like Nunu being taken into ranked matchmaking.
What if there was a minimum mastery requirement like even just level 2, since you start at level 1.
In otherwords, you must have played that champion, at least enough times to acquire level 2 mastery in order to pick that champion in ranked matches.
There would need to be one additional necessary adjustment (which should happen anyways). Mastery level should reset when a champion is significantly reworked.
This would not only eliminate the issue of new champions being picked in ranked, but it would also eliminate issues where players have never played the champion before.
Here is the big problem. I believe currently Ranked only unlocks once you have reached level 30 and own 20 champions. This would mean you would not only need to own at least 20 champions, but have achieved level 2 in at least 20 champions. I could see that being a bit of a task to place on players.
Maybe something similar to this could be balanced out, but I know people are looking for ways to solve this issue.