Once you do so, an option will come up in your "missions" tab to complete the quest and reward you with the Mew card itself, like any other mission reward
Set Mastery is also Arena's main "seasonal" structure: each new set arrives with its own mastery track, cosmetics, and a draft/event ecosystem focused heavily on that release
A unique, synergistic combination allowing you to swarm the board with cute and creepy rabbits and dealing serious damage to your opponents throughout the game
If you fancy a bit of politics, Neyam Shai Murad can use her Rogue Trader ability to help you craft the perfect deal with one of your opponents if theyre willing to let her through
If we removed the "free if you have your commander" cycle from our calculations, all of the decks would be within a few dollars of each other in terms of new nonlegendary card value, in the $20 price range