I'll take a stab at one:
Tax Collector
Types: Action
Cost: $4
Take a coin token. Each other player reveals the top 2 card of his deck, trashes a revealed Treasure card you choose, and discards the rest. Choose one of the trashed cards; take a coin token per $3 in that card's cost.
Probably not balanced, but I'm just taking a wild guess. Get a single coin token if you trash Copper or nothing, 2 tokens if you trash Silver, and 3 if you trash Gold.