Command Tower

2011-09-22 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.
2011-09-22 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.
2011-09-22 In formats other than Commander, Command Tower's ability produces no mana.
2019-10-04 The color identity of your commander is set before the game begins and doesn't change during the game, even if your commander is in a hidden zone (like the hand or library) or an effect changes your commander's color.
2019-10-04 If your commander is a card that has no colors in its color identity, Command Tower's ability produces no mana. It doesn't produce {C}.
2019-10-04 If you don't have a commander, Command Tower's ability produces no mana.

Card is in preconstructed decks:

mtg.wtf