Horribly greedy monetization. There are enemies and in the game with attacks that can eat away at your PREMIUM currency! You know, the stuff that you PAY for, or grind for hours to get in a mobile game. And it even makes you pay up premium currency if you reconsider what card to play and try a new one, before your move is even made with it! This game uses greedy tactics that I've never seen ANY mobile game resort to. It's not the most greedy, but it sure is inventive on ways to be greedy.