I hadn't seen this one before. Seems to have the potential to be interesting. Have you played around with it yet? I would imagine with the flexibility they mention (gems, equipment, etc.) that it might be a bit tough to balance.
I play it regularely and really like it. It's like a Version of Magic the Gathering with new opportunities to explore as they take full Advantage of the digital Format. Curious what the PvE patch will bring - I'm looking Forward to that.
I finally got around to playing it a little and so far its entertaining. I've just been playing around in the first PvE area and haven't tried PvP games yet. Figured I would try to build up a few cards first. From reading a few forum comments I guess the complexity was dropped a bit or something and there are at least a few people that weren't happy with the final results. Not sure how well the game is doing overall though.
Too bad that you found this only now, actually I did quit yesterday and sold off my collection because I liked the game very much and just spent too much time grinding it - the NG fighting game quest needs to be continued!