12 Labours of Hercules III: Girl Power was released on Steam with trading card support on 7 August 2015. There are 5 cards in the series, and you'll receive 3 cards at random for purchasing and playing the game.
The other installments in the game series; 12 Labours of Hercules, 12 Labours of Hercules II: The Cretan Bull and 12 Labours of Hercules IV: Mother Nature also have trading card support.