OK another good tip for bringing up your rating.
I lost alot of rating because I was busy leveling my cards, to get my ranking back up I will initiate my deck via the java client then I will add all the 8 and 7 power cards -- there arent many.
I tweak the deck to be around 8 - 9 cards. I like to keep one Leader on the deck -- to level it up.
The goal is not to KO the opponent but to simply win every hand. if you win four hand you automatically win.
If you can KO with the use of fury do it.