Arcane Signet

Artifact

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

2020-11-10:
If you have two commanders, the ability adds one mana of any color in their combined color identities.
2020-11-10:
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 {C}.
2020-11-10:
If you don't have a commander, Arcane Signet's ability produces no mana.