"Fake" gold provided by some jokers or other effects that only lasts in the mission inventory, for use with jokers that rely on gold without disrupting the economy of the game?
#Fool's Gold(?)
dusk hatch
unborn marten
Legendary Joker: “Gold Rush”
-65% gold per piece (a bit less than half of the gold you pick up will actually add to your money)
Every time you pick up a gold piece, +30% dmg for 6 seconds.
Kinda what you’re looking for?