Magic the Gathering Booster - Mystery Convention Edition

Each convention-exclusive Mystery Booster pack will contain fifteen cards: fourteen from the gigantically awesome main set (containing 1,694 reprinted cards with a unique Planeswalker symbol in the lower left of the card), and one Research and Development Playtest card. Please keep in mind that all Playtest cards will have the following warning on them: TEST CARD - Not for Constructed Play.