People buy lottery tickets from the bank for 10k. At the end of the week, one random ticket can be dropped on a banker for a prize of... say... 50% of total ticket sales. The other 50% of the gold just goes poof, sinked out of the economy. Simple and efficient. Or maybe you give some kind of rare as the prize, and poof all the money. And not even lore-breaking. From Wikipedia: "The earliest records of a lottery offering tickets for sale is the lottery organized by Roman Emperor Augustus Caesar. The funds were for repairs to the City of Rome, and the winners were given prizes in the form of articles of unequal value." "The first recorded lotteries to offer tickets for sale with prizes in the form of money were held in the Low Countries during the period 1443-1449. Various towns in Flanders (parts of Belgium, Holland, and France), held public lotteries to raise money for town fortifications, and raising money to help the poor."