Since we have this amazing ajax deck editor I think it would be nice if a similar approach would be applied to the actual game itself. So instead of having "Play" buttons underneath each card, the cards themselves would be clickable like it is in the deck editor. Of course we will need to have also some kind of ajax polling approach in order for the second player to be notified for changes in game.In this case we will not need the "Refresh" button anymore.
But if this is a big change, just leave it :P