If you're playing Curse of Strahd, you'll want to get your hands on the troika deck, a 54-card adventure supplement produced by Gale Force Nine. By using the troika deck to randomize locations within the adventure, Dungeon Masters can customize each party's exploration of Barovia, allowing Curse of Strahd to be replayed for years to come. The deck also includes rules for Prophet's Gambit, a card game for 3-5 players.