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.
The Wizards Play Network version of the Mystery Booster contains a foil card, pulled from a curated list spanning over forty Magic sets.
(Note: there also exists a Convention Edition, which instead includes a “playtest card”—an original design that sometimes bends Magic’s traditional rules.)