Imprint — When Chrome Mox enters the battlefield, you may exile a nonartifact, nonland card from your hand.
{T}: Add one mana of any of the exiled card's colors.
If no card is imprinted on Chrome Mox, it can't add mana to your mana pool. It can never add {C} to your mana pool, even if the imprinted card has a colorless mana symbol in its mana cost.
If you imprinted a multicolored card, you choose one of that card's colors each time you tap Chrome Mox for mana.