You simply tell them how many cards you are submitting and they print off labels for each card and a master label for your entire submission
You do get a few good removal spells which black and green dont excel at in this set, as well as Vulshok Heartstoker who is very much BFFs with Plague Stinger
This card prevents your opponents from swinging out at you with a board full of creatures, and forces combat to be one-on-one, both of which favor you
Once you get those fliers into play, you can make them stronger with lords and anthems like Thunderclap Wyvern, Steel-Plume Marshal, and Favorable Winds
Tribal decks aim to make use of cards that reward a player for including primarily cards of that given type and are often incredibly synergistic
Of course, knowing the stuff Black-mana mages get up to, I'm not putting both meanings of fetish are in use here