Oracle card decks claim to provide insight and positive outlooks to people. They are conceptually similar to Tarot cards, but they are often not divided into suits. They often lack what is often seen as the "darker" images of traditional tarot packs.  Oracle decks often differ in the number of cards. Common themes used in oracle card decks involve the power of positive thought and metaphysical beings such as angels, fairies, mermaids, gods and goddesses etc.