Fastest way to grind color mastery

Pacone

I know I'll have to master all cards in my collection to reach a color's platinum mastery but, which ones should I master to reach gold faster, mythics, commons...what's your strategy?

Rootbreaker

Mastering any rarity is the same number of games per mastery points earned, but mastering higher rarity cards lets you keep them in your deck for longer. I think one key to mastering things quickly is to minimize trips to the deckbuilding screen, since that interface is not exactly fast, and there's no "unmastered" filter.

Shadow_Wraith

I simply load up my deck with 8-10 unmastered cards going in order as they appear on the deck builder. Worked for all colors but is a little harder depending on which PW you use.