: Add one mana of any color among legendary creatures and planeswalkers you control.Mox Amber provides a zero-mana artifact that can produce colors represented by legendary creatures and legendary planeswalkers you control. It is especially useful in Commander decks that reliably establish a low-cost legendary creature and want that early permanent to unlock additional mana.
Kinnan, Bonder Prodigy gives a clear example. Once Kinnan is on the battlefield, Amber can produce green or blue, and Kinnan’s mana trigger adds another mana of the type Amber produced. The combination turns the artifact into a substantial source without requiring an imprinted card or discarded land.
Urza, Lord High Artificer supports Amber in a different way. Urza is a blue legendary creature that enables Amber’s own ability, and his separate ability can tap an untapped artifact for blue mana. Artifact-count payoffs also appreciate Amber even before its mana ability is useful. These interactions fit decks already built around legendary creatures and artifact development.
Amber looks at the actual colors of your legendary creatures and planeswalkers on the battlefield, not your commander’s color identity in the command zone. A legendary land or an ordinary legendary artifact such as The One Ring does not enable it by itself. Colorless legendary creatures provide no color to choose either. Removal can therefore turn Amber off at an awkward moment. Include enough early enablers and conventional mana sources that the deck can function before a legend arrives or after one leaves, treating Amber as acceleration for a supported board rather than an unconditional land substitute.
