Goodbye Deponia was released on Steam with trading card support on 17 October 2013. There are 8 cards in the set, and you'll receive 4 cards at random for purchasing and playing the game.
The other installments in the game series, Deponia and Chaos on Deponia, also have trading card support. Deponia: The Complete Journey is a modified version of all three games that has its own card set, not the cards from the separate Deponia games.