There's a distinction that's probably only obvious to people with some grad-level math: Corner cases are not the same as rare cases. Neither implies the other.
"Corners" are a measure-0 subset of a space where open-nbhd/non-singleton methods don't apply
Ie "special treatment"
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Also obvious to people who play competitive tabletop games. Manifest and double faced cards in the same Standard environment was quite a treat.
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Okay so. "Manifesting" a card is putting it into play face down as a creature. You can later turn it face up if it is naturally a creature on its front side.
Some cards are double faced and "transform" into their back side. You normally use card sleeves to disguise this in play.
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Oh god, I'd managed to forget we did that. τρομερός!
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