Mystic Deck is a term used to describe a Tarot deck, which is a set of 78 cards used for divination and fortune-telling. The cards are divided into two parts: the Major Arcana, which consists of 22 cards, and the Minor Arcana, which consists of 56 cards. Each card has its own unique symbolism and meaning, and when combined together, they can be used to gain insight into a person's life and future.