The suits on the cards are stars, hearts, swords (which look like spades), and emeralds representing wisdom, love, courage, and hope. In some decks, trees (which look like clubs) are switched out for the wisdom suit.

Playing cards are a recent fad in Oz, first introduced by The Wizard, who brought a deck from his homeland. He may have taught Ozma some card tricks on one of the three visits he made to Mombi's house.