Lilly and Sasha: Curse of the Immortals had Steam trading card support added on 2 May 2015. There are 6 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, Lilly and Sasha: Nexus of Souls and Lilly and Sasha: Guardian Angels, also have trading card support.