Commander mana production question

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In a commander game recently an opponent playing black had out Urborg, Tomb of Yawgmoth and a Gauntlet of Power set to black. Another player, playing mono white said he was tapping his Plains for black to add to his mana pool. Was that legal? Or would the color replacement effect prevent the additional mana ability from triggering?

Level 1 Judge

it would prevent the Gauntlet from triggering
proud member of the 2011 community team
This point has been debated more than once, but the [O] ruling is that it cannot trigger because you cannot tap a swamp-plains for black unles your Commander is black.