Orfeo, the Boulder and go to town
So despite this being just a Basic Energy card, not known for holding their value, perhaps the gold variants scarcity, along with the fact that its now a defunct Energy type, has contributed to it holding a pretty high value
If a player is allowed to bring a card from outside the game into a Commander game, that player can't bring a card into the game this way if it has the same name as a card that player had in their starting deck, if it has the same name as a card that the player has already brought into the game, or if any color in its color identity isn't in the color identity of the player's commander
Sure, we'll take the extra aggro
Archfiend of Despair Atarka's Command Call In a Professional Erebos, God of the Dead Everlasting Torment Forsaken Wastes Giant Cindermaw Grievous Wound Grma Wormtongue Havoc Festival Knight of Dusk's Shadow Leyline of Punishment Quakebringer Rampaging Ferocidon Roiling Vortex Screaming Nemesis Skullcrack Stigma Lasher Sunspine Lynx The Lord of Pain Tibalt, Rakish Instigator Witch Hunt