So werothegreat suggested the card name "Quacksalver" over in
this thread, and I decided a card named "Quacksalver" would have to be paired with a card called "Quicksilver". Here's what I came up with:
Quacksalver
Action-Attack: $4
Each other player trashes a Silver from his hand (or reveals a hand containing no Silver). If he does, he gains a Quicksilver from the Quicksilver pile, putting it into his hand. You may gain any or all of the trashed Silvers.
Quicksilver
Treasure: $0*
Worth $2
When you play this, return it to the Quicksilver pile.
(This is not in the Supply.)
...So essentially it's a Thief that can only steal Silver, but searches five cards rather than two and doesn't cycle your opponent's deck for them. It's even kind of thematic: the phony doctor takes your money and in exchange gives you a vial of a mysterious fluid that turns out to be mercury (which, despite being highly toxic, was actually used as a medicinal agent for centuries).
Thoughts? Is searching 5 cards overpowered for a Thief variant like this, even if it can't take Gold? If the Quicksilver pile is empty this becomes much more dangerous.