Dominion: Dark Ages (2012)

Dark Ages is the 7th expansion to Dominion. It adds 35 new Kingdom cards to Dominion, plus new bad cards you give to other players (Ruins), new cards to replace starting Estates (Shelters), and cards you can only get via specific other cards. The central themes are the trash and upgrading. There are cards that do something when trashed, cards that care about the trash, cards that upgrade themselves, and ways to upgrade other cards.