Emerald
$4 - Treasure
Reveal your hand. This is worth $1 per Victory card in your hand.
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While this is in play, when you buy a Victory card, you may gain an Emerald.
There was a decent discussion surrounding my second-place submission to the Treasure Card challenge in rinkworks' fan contest, above. I'm not really sure I want to change it at all though, for the Runner-Up challenge. I am mildly convinced that $4 is the right price. At $5... well, this card has the potential to do absolutely nothing for you, if you don't have Victory cards in hand, so I think I would have to give it an automatic $1, or maybe a +1 buy to justify that. And I don't really want to do that, since there are a lot of +buy cards in the set already, and my card would start to just look like a version of Contraband/Cache/Royal Seal/Stash.
I like the on-buy aspect, mainly because I like the similar question raised when you buy a Duchy with Duchess present, "Is another one of these good for my deck? What about another another one?" I was a little conflicted on whether it should be on-buy or on-gain, and settled for on-buy, to prevent abuse with Ironworks/Gardens, essentially. In a similar vein, I wondered if I should limit it to a certain subset of Victory cards, either just Provinces/Colonies, or only cards costing less than Province.
Thoughts?