Very very simple, but submitting for feedback since I'm gonna sit on it til next distribution anyway. Trigon suggested this as a way to make Victory Cards, but it also works as a way to iron out market deficiencies. Trigon's suggestion was that they be different types, but I think it works fine as the same type too.
{ Title: Transmutation Author: nch Co-Authors: Trigon AI: 1 If the proposal "Sets v1.3" passes then enact a new Power=1 rule titled "Transmutation" with the text: A player CAN pay 3 Cards (syn. transmute) to earn a Card of a specified type. } -- nch