Mastery 8,9 & 10
Mastery 1-5 was about how well you knew a champion. Mastery 6-7 was about how good you were with a champion. Mastery 8-10 should be about how consistent you are with a champion. You should need 4 Mastery 8 tokens, 5 Mastery 9 tokens and 6 Mastery 10 tokens. You would get Mastery 8 tokens for grading S- or better in 3 consecutive matches. However the matches would overlap. If you were on a 5 game S- or better streak you would get a Mastery 8 token on the 3, 4 and 5th matches. Leaving you only needing one more 3 game win streak or to extend the winning streak to six games with S- or better for your last mastery 8 token. This would prove that not only are you good with a champion but you are also consistently good with them. The same would be for mastery 9 but you would need 5 game S or better streaks overlapping up to 9 game S Streak. Also for Mastery 10 it would still have to be an S streak not S- streak like mastery 8 but it would have to be a 10 game S or better streak to get a token, overlapping up to a 15 game S Streak. If the streak ends before 15 games then they would have to start the streak all over again to earn more mastery 10 tokens. Upvote this if this is what you want for Mastery 8,9 & 10.