This is a six card promo set. Each card is an event that is thematically tied to one of the six animal classes represented in the base game. These cards can simply be shuffled in with the those of the base game at the start of play to add a bit of variety to the play experience. The Promo Card Set includes 6 playable cards: • Apex Predator • Intelligence • Migration • Poisonous • Semi-Aquatic • Speciation (The promo set also includes a seventh "card" which is not intended for play, only for reference: it contains card clarifications and directions for use.)