The only way to 'surrender' a match is to refresh the browser. You lose the match but won't have to go through the whole thing.
Is there a way to change my deck if it has 'reached max power available with the current cards'? One of my deck is a common card, which I can't change for a lower card with a perk or bonus.
As someone above has mentioned, how do we get an epic chest from the tower? Can you at least tell us what we need to do to get an epic chest to drop in the tower.