2 more mastery points..
I think giving the game 2 extra mastery points would be perfectly balanced and speed up games.
It's not enough to break anything, but it will help tanks get those extra one-of's that will allow them to help their team, the ADC to get that extra % damage or healing... what I'm saying is everyone would be slightly better and doing what they want to do because they have those two extra masteries without being totally broken for one role or another.