The term 'MYSTIC's Deck' is a reference to the Tarot, a type of card game that originated in the mid-15th century in Europe. The Tarot is composed of 78 cards divided into two distinct parts: the Major Arcana and the Minor Arcana. The Major Arcana consists of 22 cards that represent archetypal symbols and are used for divination, while the Minor Arcana consists of 56 cards divided into four suits. The Tarot is often used as a tool for spiritual guidance and self-reflection.