Bargain
$3 - Reaction
When you would gain a card, you may reveal and discard this. If you do, instead, gain a card costing exactly one more than it.
For buying one card, this is just a copper, but it interacts strongly with gainers, multiple buys, swindler, cursers etc. I originally priced it at $2 before looking at the list of cards and seeing just how many things it interacts with. What do you guys think? Are there any broken combos I'm missing?
Also, can someone think of a better name? I think a location where you can get things for a reduced price with a medieval theme would be good. I would have called it Black Market if that didn't already exist.
Edit: I'm an idiot. It doesn't interact with multiple buys at all because you have to discard it.