Savage Worlds Action Deck - Rules of Play says:

The all-new over-sized Savage Worlds Action Deck (used for initiative in the game) is a throwback to our favorite deck ever, with art by the original artist, Cheyenne Wright! Each suit features iconic characters from four core genres: fantasy, pulp, diamonds, and horror. On the back of each card is a reminder of the suit order as well (Spades, Hearts, Diamonds, Clubs) for resolving ties.