Deck D: In the Deadly Aliens Expansion decks, KB Odyssey players can now add from a pool of 30 new cards to construct their own deck. all Killer Bunnies® games, these boosters don’t just add extra duplicate cards, they introduce new mechanics and bring out unique aspects of gameplay. KB Odyssey Deadly Aliens Expansion Decks provide players with 30 more cards with new, powerful mechanics to be mixed in with their personalised decks as they wish.