Rulings

• 2014-11-07
  The color identity of your commander is set before the game begins and doesn’t change during the game, even if your commander is in a hidden zone (such as your hand or your library) or if an effect changes your commander’s color.
• 2014-11-07
  If your commander has no colors in its color identity, Commander’s Sphere produces no mana.
• 2014-11-07
  In formats other than Commander, Commander’s Sphere produces no mana.
• 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, Commander’s Sphere’s first ability produces no mana. It doesn’t produce .
• 2020-11-10
  If you don’t have a commander, Commander’s Sphere’s first ability produces no mana.