This article is from the Magic: The Gathering Rules FAQ, by Patrik Linell (pls@claymore.nu) with numerous contributions by others.
No. Magic has exactly five colors in it: White, green, blue, red
and black. They are the only ones that can be chosen when you're asked to
choose a color.
B:04 Do basic lands have colors? (e.g. are swamps black?) (Magic: The Gathering Rules)
No. Lands are colorless unless something gives them a color.
 
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