Each box contains 24 Mystery Booster Convention Edition Boosters, each with:
- 2 white commons or uncommons
- 2 blue commons or uncommons
- 2 black commons or uncommons
- 2 red commons or uncommons
- 2 green commons or uncommons
- 1 multicolor common or uncommon
- 1 artifact or land common or uncommon
- 1 rare or mythic rare with the card frame introduced in Core Set 2015
- 1 card from before Core Set 2015 (can be a common, uncommon, rare or mythic rare)
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- 1 "playtest card"—an original design that sometimes bends Magic’s traditional rules
