I thought the same, until I discovered a nice color combo. Played PvP several times and won all games.

Also, how do you change your primary color generator? I'm using different colors and every turn I get useless mana.

You should remove most of the mana info. I mean, if I´m using a two color deck, why do you need the 10 additional mana sprites? It's eye-litter.

You need to add a back to menu button, as a Log Out one.