How to get mastery chests really easily.

Grades are based on comparing your performance to the performance of other people playing the same champion and role, so your goal here is to get yourself compared to the smallest and worst pool of other players as possible.

So far: Galio jungle 4/4/16 : S+ Ahri ADC (triforce, PD) : S to S+ almost every game Veigar support: A to S reliably.

Anything else that works reasonably well, but is so weird nobody plays it, is an almost guaranteed S if you can play it will. Take your favorite champions places they are not meant to go and enjoy the free mastery.