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The Mystery Booster 2 Playtest Card Notes section (reproduced here in individual Gatherer rulings) provides guidance for fitting these cards into the existing rules structure

Now, some cards may not feel like a fit due to the nature of their abilities, but as more come out, more will be able to slot into preexisting decks

Buttercup, Provincial Princess Silence Battle of Wits Vizzini, Criminal Mastermind Rodents of Unusual Size Westley, Dread Pirate Roberts Fezzik, Rhyming Giant Inigo, Avenging Swordsman Miracle Max, Unemployed Each card has flavor text that are quotes from the film, like Inigo Montoya's classic, "Hello

Supplement with singles for the specific rares and mythics you are missing