• 36 Wilds of Eldraine Booster Packs • 15 Magic: the Gathering cards each Booster Pack • 3-4 Uncommon Cards Each Booster Pack • 9 Common Cards Each Booster Pack • 1 Land Card (33% Chance for a Full-Art Land) • At least 1 Special Borderless card of rarity Uncommon or higher • 1 Traditional Foil card replaces a Common in 33% of boosters
Starting with The Brothers' War, Buy-a-Box Promos will only be available for in-store pick-ups and purchase while supplies last as stated in Wizards of the Coast's article here.