If this is the first time you played a Fool's Gold this turn, this is worth 1 Treasure, otherwise it's worth 4 Treasure.
When another player gains a Province, you may trash this from your hand. If you do, gain a Gold, putting it on your deck.
Trash a card from your hand. Gain a card costing up to 2 Treasure more than the trashed card.
If there are one or more empty Supply piles, +1 Card. If there are two or more, +1 treasure and +1 Buy.
Discard 2 cards.
When you gain this, look through your discard pile (including this), reveal any number of Action cards from it, and shuffle them into your deck.
While this is in play, when you buy a card costing 4 treasure or less that is not a Victory card, gain a copy of it.
Reveal the top 4 cards of your deck, then discard them. +1 treasure per differently named card revealed.
Trash a Treasure card from your hand. Gain a Treasure card costing up to 3 Treasure more, put it into your hand.