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This means that, while not a part of every MTG set, MTGs designers are free to use them as they please

Alternatively, it could be a promo given out at an upcoming MTG event

Contents: Get a lore-packed Epilogue Booster to witness the conclusion of the March of the Machine storyline 5 Magic: The Gathering cards per booster 13 cards of rarity Rare or higher and 24 Uncommon MTG cards in every pack Guaranteed foil and Showcase card in every pack Rebuild the Multiverse while building up your collection Case Configuration: 24 Boosters per Display, 12 Displays per carton Pack Dimensions: 0.197" x 2.677" x 4.803" (5 x 68 x 122mm) Pack Weight: 0.064 lb

That tells me, for example, that I don't want to be playing the most efficient aggressive black creatures in the format, because I expect games to go longer and win by card quality