http://steamproxy.com/steamstore/app/391240/
Forgotten lore is an online trading card game that has in-game cards as steam inventory items as well! The game mimics alot from hearthstone, and the devs are working towards making the game free to play, however that is in the far future (dev confirmed around a year).

The game is usually $9.99 in the steam store, for the summer sale it is $4.99. However you can get Forgotten Lore and 10 other games for $3.49 @Indiegala right here https://www.indiegala.com/friday