From MTG Salvation Wiki
Colorless has two in-game meanings.
From the Comprehensive Rules:
- Colorless
- An object with no color is colorless. Lands are colorless because they have no mana cost. Most artifacts are colorless because they have no colored mana in their mana costs. Face-down creatures are colorless due to the effects that turn them face down. A colorless object can be given a color by an effect.
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From the Comprehensive Rules:
- Colorless mana
- Numeral symbols (such as
 ) and variable symbols (such as  ) can represent colorless mana if they appear in the effect of a spell or ability that reads, “add [mana symbol] to your mana pool,” or something similar.
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