Well, ran into another $10 portrait changer... That said, played a decent battle against him (he was a mage). I was in my druid deck. He was breaking out all the right cards, but I was lucky to almost always have the answer.
Long story short, after forcing all his transforms out of his deck, I was sitting with deathwing and both the "wonder twins" (fuegen and stallag) as well as a big game hunter (which I had yet to have a use for), and we are well past turn 10. I plopped down both the wonder twins figuring what the hell (the enemy mage is down to 12 health at this point as I have been smacking away whenever I can, but had been giving up board control over the last 1-2 rounds, since I had deathwing in my hand to regain it, but had yet to draw both wonder twins). This left me with an almost dead iron bark on the board, plus the two wonder twins, but he had at least 5 low attack minions out (one of them was the 2/4 do 2 damage on spell, which is why he didn't smash all his minions against the ironbark last round). So he unloads his hand, freezing all my minions, casts a do 3 random enemy minion damage, and then plops down a tazdinga (3/5+taunt), leaving just 1 card in his hand. An additional 4 damage spread across my hero and finished off the ironbark, but both the wonder twins survived. He then proceedes to attack my hero hoping to knock me down before I could do anything since he figured he had a free turn with the freeze on my minions (he must have never been hit with the deathwing, wonder twins combo, but then again, not many people have since deathwing doesn't sit in many decks).
So, of course, Deathwing is the play (it also only cost me 8 since I had Emperor on the board 2 turns), and I hero power to hit the mage down to 11 hp (I only lose a big game hunter and the sludge beltcher that I just drew out of my hand), but it clears the board, and double summons Thaddius (since both twins died when Deathwing appeared, their deathrattles trigger after both were already dead, meaning they each summon a Thaddius). So now, I have no cards in my hand, but a 12/12 Deathwing, and two 11/11 Thaddius's on the board, all of which will one hit kill the enemy and he only has 1 card in his hand (2 once he draws). He draws a 6/5+taunt, and casts a freeze spell on one of the Thaddius's, emptying his hand... game over.