Sigillo Arcano (Arcane Signet)

2020-11-10
If you don't have a commander, Arcane Signet's ability produces no mana.

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 .

2020-11-10
If you have two commanders, the ability adds one mana of any color in their combined color identities.