For the final expansion to Dominion, Rio Grande offers one of the smaller boxes, including 13 Kingdom cards themed around medieval professions.
Dominion Guilds also features cards with two new mechanics. Some provide Coins, metal treasure tokens that can be saved and spent across multiple rounds. Others allow a player to “overpay” when purchasing, with the excess treasure providing a variety of benefits. For example, when purchasing the Stonemason, a player gains two Action cards that cost the amount overpaid. Each extra coin overpaid for the Doctor allows the player to look at a card from the draw deck, trash it, discard it, or put it back. Though these benefits apply only at the time of purchase, it’s an interesting way, I think, of keeping less expensive cards relevant throughout the game.