Hearthpwn

Took down Kel'Thuzad (finally) with this build of Paladin. Exploiting the GvG cards that the AI is not really tuned against makes things a little easier (at one point in my victory run KT Frostbolted an Abusive Sergeant when a 5/1 Clockwork Gnome was right next to him.) 

Works like a Divine Favor deck, except you have to cull those for dudes. I swapped in a Cult Master for mid-game draws when Abominations hit the table--you need to Ironbeak those, they are the worst part of the matchup.

You don't really have any good minions to steal, so Chains is a weak play, so try to get through that armor ASAP. Ideally you'll have an Equality in hand to temper the 5/5 Taunts with your pile of garbage guys. Be prudent with Divine Shield to survive Abomination blasts and you should roll him. 

I was working with the cards I have, no there are plenty of spots for improvements, notably Equality/Consecrate should be 2x, as should Muster for Battle, because juggling is awesome.