Opal Palace (CM2) from Commander Anthology Volume II, available at 401 Games Canada.

• Rarity: Common
• Finish: Normal
• Artist: Andreas Rocha
• Card Text:
  T: Add C.
  1, T: Add one mana of any color in your commander's color identity. If you spend this mana to cast your commander, it enters the battlefield with a number of additional +1/+1 counters on it equal to the number of times it's been cast from the command zone this game.