I'm thinking about including proxies of the Mystery Booster Playtest Cards in my cube. What do you think? : r/mtgcube
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![Mystery Booster - Booster Box [Convention Edition] (2021) - Mystery Booster: Convention Edition Exclusives - Magic: The Gathering](https://product-images.tcgplayer.com/246935.jpg "Mystery Booster - Booster Box [Convention Edition] (2021) - Mystery Booster: Convention Edition Exclusives - Magic: The Gathering")