We Should Be Able To Continue Leveling Masteries!

Let me explain.

So right now let's say we have a maxed champion level 7. We should be able to continue leveling up the mastery of them forever, however, we don't change the mastery icon or anything like that. All of it stays the same except for the number. Every level also requires more and more points. Instead of just staying 7 forever, why not just rank it forever? Just as a challenge to get a champion super high.