Thanks silverspawn, that was totally unexpected for my quick hack.
Hinterlands is one of my favorite expansions, so let's do it.
Contest 9: HinterlandsThis is quite a big expansion introducing a new mechanic of "when you gain/when you buy" effects. It encourages bulkier decks with having quite a lot of sifters and not having fast trashers.
The themes of Hinterlands:(as specified by Donald X in
http://forum.dominionstrategy.com/index.php?topic=1818.msg28889#msg28889)
9 effects when gained/bought: Noble Brigand, Nomad Camp, Cache, Embassy, Ill-Gotten Gains, Inn, Mandarin, Border Village, Farmland
4 other interaction with gain/buy: Duchess, Fool's Gold, Trader, Haggler
7 Victory/Treasure/Reaction: Fool's Gold, Tunnel, Silk Road, Trader, Cache, Ill-Gotten Gains, Farmland
4 interact with Victory cards: Crossroads, Duchess, Fool's Gold, Silk Road
8 card filtering: Oasis, Oracle, Jack of All Trades, Cartographer, Embassy, Inn, Margrave, Stables
I would also mention the theme of Silver/Gold gaining (Embassy, Noble Brigand, Fool's Gold, Trader, Jack of All Trades, Tunnel), and Horizontal Line (more than a half of Hinterlands cards have one)