Doom Blade and Multicolored Creatures

A common mistake I see newer (and some veteran!) players making is misunderstanding how a permanent's colors work. For example, I've seen many a person think that when says it destroys a nonblack creature, what that means is that the creature has to be a color that isn't black. So, by their logic, an it, because she's red! Red is nonblack, right? The problem with that line of thinking is... well, it's wrong. When something in Magic refers to a characteristic like color (or in the case of , the

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