Command Tower

Land   

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

705 CMR • ENRyan Yee

™ & © 1993— Wizards of the Coast

Notes: TODO: Update Copyright

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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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.