Chrome Mox
Mirrodin — rare
Artifact
Chrome Mox rulings:
2020-08-07: If no card is imprinted on Chrome Mox, it can't add mana to your mana pool. It can never add to your mana pool, even if the imprinted card has a colorless mana symbol in its mana cost.
2020-08-07: If you imprinted a multicolored card, you choose one of that card's colors each time you tap Chrome Mox for mana.