Straight out of the ever so elusive Ravnica: Clue Edition , Mastermind Plum is a very powerful card draw engine stapled to a creature
Then you may pay and 3 life
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Stonybrook Schoolmaster: From Lorwyn, Merfolk there gave a benefit when they become tapped - which is what you need to do to crew vehicles, and the tokens it makes are perfectly disposable blockers or bodies to crew vehicles
