Maybe I'm dumb, but I can't figure out how to get to the main menu if I want to quit. I can't find options to shut off the music, etc. A couple of these features, or making them more obvious, would be nice.
Movement is difficult...the game is awkward. The big banners that pop up in the marketplace are kind of irritating. Needs a bigger screen...I can't get comfortable with the game. I basically stand back and watch my troops do all the fighting. Also...I'm not fond of games that require both keys and a mouse simultaneously.
I'd buy a card from the site if they were for sale.
And solicit character and item designs from the community. there should be a pretty easy point-based design system that players can use, a la steve jackson's hero system, to maintain balance.
With a small text & graphics tweak, you could offer this as to whoever handles the Dr. Who website. The time pod looks like a TARDIS anyway. It's pretty clever.
I think you should be able to earn cards by playing the bots. And for new cards...maybe allow site members to submit cards, and have a li'l sweepstakes, pick the best suggestions.
 "Elements of Arkandia"){kind=icon}
 "The Final Death Wish"){kind=icon}
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 "Monster Master"){kind=icon}
 "Feudalism II"){kind=icon}
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 "Kongai"){kind=icon}
 "Vector Runner"){kind=icon}
 "Chronotron"){kind=icon}