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If you open one, youre probably playing Dimir

Two creature types have strong enough synergies to show up later in the list, but there arent quite enough in angels, clerics, elves, legends, and vampires to create critical mass in a typal deck, but heres some of the good ones: Bishop of Wings Cordial Vampire Elvish Dreadlord Orah, Skyclave Hierophant Patron of the Vein Ratadrabik of Urborg Skemfar Avenger #19

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

The ability to play cards off the top of your library is powerful card advantage especially in Selesnya colors