Online only card:
Counterfeit $3 Treasure
Worth $3
When you play this, each other player thinks that you've played a gold.
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In games using this, whenever someone plays a gold, you may suspect counterfeit. If you do, and the Gold was actually a counterfeit, he must trash Counterfeit and -2VP, and the counterfeit is worth $0 instead. Otherwise, you gain a curse.