The pricing of M:TG, but with a "chessboard" rule set that seems more complicated than innovative.
The free single player campaign is short and easy, so online multiplayer is where the game truly happens. Unfortunately card quality is as different as in the original M:TG, meaning that one can buy a ton of boosters and still have to make compromises when equipping a 40 card deck.
Most of the cards are basically copies of M:TG cards with the same stats, which is quite peculiar since the game mechanics are totally different. Abilities like flying, first strike and trample work in completely different manners, yet no attempt at rebalancing the cards for the new rules has been made. Particularly flying creatures are overpowered as basic ground creatures have no way of attacking them, yet they can still block the path of those same ground creatures, thus providing good defence without having to engage in combat, unless they want to, in which case they as attackers strike first and only have to suffer a retaliation if they don't manage to kill the target.
The most complicated concept of the rules is the initiative, some cards get to act more often than others. Exactly how the number translates into positions in the turn order bar is not completely clear to me, and probably not to anyone else as there is no proper rulebook. In any case the result is that on top of keeping track of the board and the reach of each opposing creature you also have to consider the not at all simple turn order, in order to properly predict how the play will advance.
The interface in general could have been better, some information is missing here and there and unit selection and orders ain't fitted properly to 2D gameplay with 3D graphics, and at peak hours the servers seem to be overloaded.
These are not flaws that ruin the game, but together with the not too polished rule set it makes a game that hardly justifies pouring money into the bottomless pit of a trading card game.