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It computes the exact joint probability that a single draw meets several requirements at the same time, such as "at least 2 lands and at least 1 removal spell" in your opening 7

Misprint/Error Cards This one is a little more difficult to keep an eye out for, but sometimes mistakes happen

If another effect caused the land to have one or more colors, the resulting creature land will retain those colors

Mark says you can even change the copyright date, but don't tell the lawyers

The clearest issue is the microscopic alignment of print layers, making even the smallest amount of retouching immediately detectable

All of these cards can provide absurd value in the right decks - getting more than one mana from a single land is always fantastic, and the ceiling on these is so, so high