Lands you control are Plains.
Nonland permanents you control are white. The same is true for spells you control and nonland cards you own that aren't on the battlefield.
You may spend white mana as though it were mana of any color. You may spend other mana only as though it were colorless mana.
Nonland cards you own that aren't in play are white. Nonland permanents you control are white. Lands you control are plains. Colored mana symbols in the costs on all those cards and permanents are .
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