Giana Sisters: Twisted Dreams - Rise of the Owlverlord had Steam trading card support added on 26 September 2013. There are 5 cards in the series, and you'll receive 3 cards at random for purchasing and playing the game.
The other instalments in the game series, Giana Sisters: Twisted Dreams and Giana Sisters: Dream Runners, also have trading card support.
Trading Cards
Foil Cards
Badges
Booster Pack
Emoticons
Profile Backgrounds