I've got the same problem but in a slightly different way. I'm on Heroic Into The Eye and I've got Karzoug down to the last card, however, before that I've got to defeat the Enslaved Blue Dragon. Ezren has used lightning bolt successfully and defeated the dragon but after he makes the roll to recharge the card (which is automatically successful due to his high arcane skill) the dragon just sits there and there's no option to do anything. If close down the game and open it up again it brings me back to Ezren's recharge roll with the same outcome. I can't see any other way than to forfeit the game. I've cleared the game cache and force stopped it but it doesn't seem to change anything.