Mystery Booster: Convention Edition Booster
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Each Mystery Booster: Convention Edition booster pack contains fifteen cards: fourteen from the gigantically awesome main set, and one from that "something new and surprising" group of R&D Playtest cards. You can check out these unique cards on Gatherer and revisit the Mystery Booster Release Notes and Gavin Verhey's article about the development of Mystery Booster to learn even more. We also have a full list of R&D Playtest card names and the artists if you're curious about the unique visual illustrations these cards feature.