Command Tower

Land   

: Add to your mana pool one mana of any color in your commander's color identity.

When defeat is near and guidance is scarce, all eyes look in one direction.

281 C13 • ENRyan Yee

™ & © 1993—2013 Wizards of the Coast

Legal in: Legacy,Vintage,Commander

Oracle Text (click to copy):

Command Tower Land {T}: Add to your mana pool one mana of any color in your commander's color identity.

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View this MTG card on Gatherer

9/22/2011
The color identity of your commander is set before the game begins and doesn't change during the game, even your commander is in a hidden zone (like the hand or library) or an effect changes your commander's color.
9/22/2011
If your commander is a card like Kozilek, Butcher of Truth that has no colors in its color identity, Command Tower's ability produces no mana.
9/22/2011
In formats other than Commander, Command Tower's ability produces no mana.

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Card Command Tower is not on TCGPlayer.