Dominion (Card Game) Wiki
Type Action
Effect Trash a Treasure card from your hand. Gain a Treasure card costing up to 3 Coins more; put it into your hand.
Cost 5 Coins
Set Dominion: Base Set
Illustration Claus Stefan

Additional Rules from the Rulebook[]

Generally, you can trash a Copper card and gain a Silver, or trash a Silver card and gain a Gold. However, you could also trash a Treasure to gain the same Treasure or a cheaper one. The gained card goes in your hand; thus, you can spend it the same turn. If you don't have a Treasure card in your hand to trash, you can’t gain anything.

The Secret History of Mine[]

In an article on Board Game Geek, Donald X. Vaccarino commented on the development of Mine:

Of the 10 Actions in the first game ever of Dominion, this has changed the least. It always cost 5, and always let you trade Copper for Silver or Silver for Gold. The only difference is that now it phrases this as "gain a Treasure costing up to 3 more," as if someday there might be other treasures that this would also work with.[1]