Deathrattle Death Knight is the way to go.

Used a mage deck I seen on Hearthpwn by larryvarza, went 6-0 with it.

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Warlock- The Soularium/Soul Barrage destroyed my Rogue- Pogo/Shadowstep deck.

correct

Might want to say focus on getting Queen Azshara to 50 health for the final battle, I had her at 55 and instead of attacking my 5/6 minion into her, I killed off the 5/10 enemy minion(Daithil?), and she killed me on the next turn.