I'm interested in this mechanic, and want to find a fan card to fit it
Starting simple:
Troll
Cost: 2
Action
+1 Action
+$3
All cards (including cards in players hands) cost $1 more
Compared to silver, it's got the advantages that come with being an action and not a treasure, but it should be worse, as it takes away from +buys. However there are some cards it combos with; Apprentice nets you an extra card, Trader gets you an extra silver and coppers can be Salvaged and Forged into more than nothing.
What card would best fit to this mechanic
I'm thinking it would include a +buy, to highlight the fact that +buys are made worse and non terminal so the actions that benefit from it can be played after it. The higher the price increase, the more exaggerated the effect, especially its effect on Workshop type cards.
My best effort:
Troll Booth
Cost: 4
Action-Duration
+1 action
Now and at the start of your next turn: +$2, +1 buy
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While this is in play, all cards (including cards in players hands) cost $1 more