This is a Preorder - Product will be available at the Release Date.

MTG Booster: The Brothers' War Collector Booster Box (12 boosters per box)

Collector Boosters are supercharged booster packs with the most desirable cards from The Brothers' War--open a pack and fill your collection with rares, foil, special art, and showcase frames.

Each The Brothers' War Collector's Booster contains
-15 total cards
-10-11 foil cards
-5-6 Rare or higher
-1 double-sided foil token