Included in the set's 131 cards is the ultra-rare First Officer Spock, a handful of Rare+ cards (33% more rare than rare), and a distribution of Rare, Uncommon and Common cards, similar to other Star Trek CCG sets. In Mirror, Mirror, you'll find more personnel per capita than in any previous Star Trek CCG set, including the "mirror personae" of TOS and Deep Space Nine personnel who've entered the Mirror Universe.