I've always wondered about the basic land thing. I've never asked because I've never cared to build a colorless deck. But by all rights basic lands have no rules text. The big mana symbol on their text box is essentially flavor text which is why full art lands can exist without issue. The ability to tap for mana is all wrapped up in their sub type. For evidence of this see the Shock Lands such as Steam Vents whose only text is technically the shock ability, while the ability to add mana is parenthetical reminder text.
Lands whose type includes swamp, island, plains, forest and/or mountain (e.g.: basic lands, shocklands, dual lands, Shadowmoor special-basics, etc) also have the corresponding colour identity. As such, they may not appear in a deck unless the Commander is also of the appropriate identity.
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Sorry for my possible english mistakes, I'm not a native speaker.
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It is actually specified on the official website :