Look at the bottom card of your deck. You may put it on top.
Discard 3 cards.
Trash this and another copy of Treasure Map from your hand. If you do trash two Treasure Maps, gain 4 gold cards, putting them on top of your deck.
You may reveal a Treasure card from your hand. Gain a copy of it.
When you buy this, trash all Treasures you have in play.
While this is in play, when you buy a Victory card, gain a Gold.
Each other player discards a Copper (or reveals a hand with no Copper).
Each other player chooses one: he discards 2 cards; or he gains a Curse card, putting it in his hand.
When you play this, it's worth 1 per Treasure card you have in play (counting this).
My friend and I created this game, we each chose 5 cards we wanted to play with. I chose Treasure Map, Warehouse, Hoard, Bank and Great Hall. Warehouse + Treasure Maps are always my money-making combo early in the game (if I get to choose cards), Hoard & Bank keep the money rolling in. I was lucky she chose Pearl Diver, it wound up being an unexpected advantage during my hunt for treasure :)