Brath, Trader of Souls

{w}: Target opponent gains control of a
permanent you control, create a colorless Gold artifact token with "Sacrifice this artifact: Add
one mana of any color to your mana pool."
{1}{b}{b}: Exchange control of target permanent
you control with target permanent an opponent controls with the same converted mana cost.
{2}{w}{w}{b}{b}: Create a Gold token, then exchange control of it and target permanent an opponent controls.