Sorry for the small window, but I only just found out. Faeria (still in Early Access) is available for free until August 10th at 4pm Pacific. Haven't played it, but looks interesting. It goes free-to-play on August 24th, but there's no indication of the difference between the free unlock and the FTP version.
Faeria combines the core values of Strategy Card Games together with a Living Board, giving you the ability to shape the board as you play to create mind-blowing strategies. Each game of Faeria is not only unique, beautiful and fast-paced but also highly competitive.
Note: Requires 3rd-Party Account: Abrakam Account (Supports Linking to Steam Account)