I got the promo code yes, I've started testing it yesterday. My first impression was not that overwhelming. It's somewhat similar to other steem games, the endorphins are coming form the potential rewards and not really from the game itself. Visuals are rather average (especially compared to hearthstone). I do fear I'm stuck playing each day now to get the free card reward :)
I really would like to see a game on steem people would play regardless of the rewards. I you are into these things you should check out clash of streamers, that entire game is just designed to push reward buttons like crazy.