The term 'Deck for Diviners' can be summarized as a set of cards used for fortune-telling. Specifically, the crossword solution for this term is 'Tarot', which is a type of card deck used for divination and fortune-telling. Tarot cards are believed to have originated in the Middle Ages and were used by mystics and occultists to gain insight into the future. The deck consists of 78 cards, divided into two parts: the Major Arcana, which contains 22 cards, and the Minor Arcana, which contains 56 cards.