There are 3 paths within this feature:

A free path - this is always active, and it will grant you free rewards once you have completed certain goals.
A Golden path - this can be unlocked by purchasing the Golden Mastery Pass, and it will grant you premium seasonal rewards.
A Platinium path - this have to be unlocked by purchasing the Platinium Mastery Pass and includes all rewards from golden. Find exclusive rewards there like Advanded Perks.

Please keep in mind that you will not receive the rewards immediately after purchasing the Dragon Mastery Pass; you must first proceed through the course by accomplishing the goals.