Playable with both the core Resident Evil Deck Building Game and Resident Evil: Alliance, the 150-card Nightmare expansion set introduces new cards such as Luis Sera, Sergei Vladimir, and Mine Thrower designed to help add to the excitement of the four existing Modes of play: Story, Vs., Mercenary, and Outbreak. However, the nightmare is only beginning when the Infected Osmund Saddler makes his appearance!