Alamaya, the Ransom Queen

Whenever an opponent casts a spell, unless that player pays {1}, create a colorless artifact token named Gold with "Sacrifice this artifact: Add one mana of any color to your mana pool."
{x}{u}{w}: Gain control of target permanent spell.
X is its converted mana cost. Spend only mana produced by Gold tokens on X.
Her business relies on the fact that each wyrm she defrauds is too embarrassed to tell the others.