Someone mentioned in another thread how easy it was to mix these up:
Counterband
Treasure - $5
Worth $3
+1 Buy
When you play this, the player to your left names a card. You can't buy that card this turn.
You may play a Treasure from your hand twice. If you do, trash that Treasure.
(This is almost certainly exceedingly overpowered.)
Also readily mixed up:
Minet
Action - $5
Trash a Treasure card from your hand. Gain a copy of it, putting it into your hand.
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When you buy this, trash all Treasures you have in play; for each one, gain a Treasure costing up to $3 more, putting it into your hand.
(That's an amazing on-buy, and possibly the least-interesting on-play on any card.)
Farmgrounds
Victory - $6
Worth 2 VP for every five differently named cards in your deck (rounded down).
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When you buy this, trash a card from your hand. Gain a card costing exactly $2 more than the trashed card.
(Using Farmgrounds to trash Farmgrounds for a Province no longer looks so great.)