Suppose we wanted a card that had this rule:
"When you buy this card, +1 buy and all cards cost $2 less for the rest of this turn (but not below $0)."
Is there any combination of cost and other behavior that could render such a card balanced?
Some thoughts:
Presumably it should be something you don't want to clutter up your deck with too much of; we don't want people to have too much incentive to buy out the whole stack on one turn and then grab a Colony for free. Maybe a 2-point Victory card? I'm thinking Farmland as a model here. You still might do that whole-stack buyout in endgame, though, so maybe a victory card isn't the right way to go. Weak terminal action is also a possibility—something that someone might want to buy before endgame, but not too many of at once.
Farmland might also be a good comparison point for pricing. With Farmland, if you have $8 you buy a Province, but if you have $9 you might buy a Farmland and remodel a Gold. So suppose this is $6. In that case, if you have $8 you can buy one of these and let's say a Caravan.... You'd probably go for the Province anyway. If you have $9, you can get this and a Duchy—not as good as Farmland, but you don't have to trash a Gold for it either. With $10, you can one of these and a Gold, or two of these and a Caravan.... Hm. To buy out the stack, you'd need $12.
If it's $5, then $8 gets you one of these and a Duchy, or two of these and a Gardens.... $9 empties the stack. That's too cheap. If it's $7, then buying out the stack costs $16, but by the time you can put together $16, a few of these may already have been bought.
Other sources of +buy could make this insane, of course.
Thoughts?
