Treasure
Treasure is a card type that may be played during one's buy phase. Most Treasures provide some + (Horn of Plenty being the chief exception), and some treasures have other effects as well. Unlike Action cards, any number of Treasure cards may be played in any order. Action cards that give + are not considered Treasures, and there are no Action–Treasure cards in official Dominion.
The strategy of buying only Treasure cards and, in the endgame, Victory cards, is called Big Money. This may be the best strategy in some "weak" kingdoms, but is usually outclassed by adding a few Action cards to the Big Money deck, or by Action-heavy engine strategies.
Treasure cards have yellow frames. There are five basic Treasure cards: Copper, Silver, and Gold, which are in the supply in every Dominion game; Potion, which is added when cards from Alchemy with in the cost are available; and Platinum, which may be added in games using Prosperity cards. There are 17 Kingdom Treasure cards, the greatest number of which are from Prosperity, which has Treasure as a sub-theme. Diadem and Spoils are special Treasure cards that may be gained from outside the supply by special cards that give access to them.
List of Treasure Cards
Copper, Diadem, Spoils
Fool's Gold
Loan, Masterpiece, Silver
Philosopher's Stone
Potion, Quarry, Talisman
Cache, Contraband, Counterfeit, Horn of Plenty, Ill-Gotten Gains, Royal Seal, Stash, Venture
Gold, Harem, Hoard
Bank
Platinum