The idea of the Mystery Booster is that it is a product that you don’t know what it is until you open it up; the mystery is a feature of the product.The main set contains 1,694 cards of equal rarity.However, 30 cards has themythic rarecolored expansion symbol, 152rare, 452uncommonand 1060common. The reprints are from all throughout the game's history, going as far back asMirage.There are also cards fromsupplemental sets. In contrast to regularChaos limited, which has many set-based synergy cards that don’t work in that environment, this curated set maintains the chaos feel but it lets decks actually be functional, good and fun to play. The cards have a whiteplaneswalker symbolin the bottom left, meaning that these are fresh prints designed to look like the original cards. Apart from the added planeswalker symbol, the reprints are "straight pick-ups", meaning that Wizards of the Coast literally used the original card file to print them. That is a different thing than printing a new card, with updated rules text, which is how they normally make cards.