Rulings

• 2013-10-17
  If your commander is a card like Kozilek, Butcher of Truth that has no colors in its color identity, Opal Palace’s last ability produces no mana.
• 2013-10-17
  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 (like the hand or library) or an effect changes your commander’s color.
• 2013-10-17
  The “number of times it’s been cast from the command zone” includes the most recent time. For example, the first time you cast your commander from the command zone in a game, if you spent mana from Opal Palace’s last ability to do so, it will enter the battlefield with a +1/+1 counter.
• 2013-10-17
  In formats other than Commander, Opal Palace’s last ability produces no mana.
• 2020-11-10
  If you don’t have a commander, Opal Palace’s last ability produces no mana.
• 2020-11-10
  If your commander is a card that has no colors in its color identity, Opal Palace’s last ability produces no mana. It doesn’t produce .
• 2020-11-10
  If you have two commanders, the last ability adds one mana of any color in their combined color identities.
• 2020-11-10
  If Opal Palace’s last ability produces two mana (most likely due to Mana Reflection) and you spend them to cast a commander, that commander enters with two counters for each time it’s been cast from the command zone this game.