Arcane Signet

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

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If your commander is a card that has no colors in its color identity, Arcane Signet's ability produces no mana. It doesn't produce .

If you have two commanders, the ability adds one mana of any color in their combined color identities.

If you don't have a commander, Arcane Signet's ability produces no mana.