Mystery Booster is a booster pack release inspired by those 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, plus 121 copies of something new and surprising. You could fill an entire eight-person draft and not see the same card twice.
The Mystery Booster is loaded with reprints from over forty previous Magic sets—but these reprints aren’t exactly what today’s Magic players are used to opening in their packs.
Unlike customary reprints, Mystery Booster cards are presented in their original form—original frame, art, typesetting, expansion symbol, legal text, and all.