Available on or about June 5!
Mystery Booster is a booster pack release inspired by Chaos, Cube, and off-format drafts. It is, in effect, a chaos draft in a pack with some twists.
The set itself contains a whopping 1,694 reprints from all throughout the game's history.
Each Mystery Booster pack will include fifteen cards: fourteen from the main set and one of 121 possible foil cards. The foil cards are cards not found in the main set (yes, above and beyond the 1,694 already in there), making the Draft experience even more repeatable.
Here's some of the magic that makes Mystery Booster so unique. Each of the 14 boosters slots from the main set of 1,694 cards has its own sheet of 121 possible cards.
Cards in Mystery Booster will have the original set symbols and numbering of one of their printings. The only difference? A little Planeswalker symbol in the lower left corner.
Contents of each Mystery Booster pack:
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 from before Core Set 2015
1 other rare or mythic rare
1 foil card pulled from a curated list