While Magic's history stretches back 30 years, the lore of Dominaria itself is much longer. Returning to a pivotal story of Dominaria's—and Magic's—history, what started as a feud between Urza and Mishra erupted into an all-out war that set into motion the future of the plane and Multiverse itself.

The Brothers' War Collector Booster Box contains 12 The Brothers' War Collector Boosters. Each Collector Booster contains 15 Magic: The Gathering cards and 1 Traditional Foil double-sided token, with a combination of 1 special Mythic Rare, 5 cards of rarity Rare or higher and 4 Uncommon, 4 Common, and 1 Land cards. Every pack contains a total of 10–11 Traditional Foil cards.