Went up against a Priest in casual mode. I'm using my version of Reno Handlock and he Thoughtsteals on turn 3. Turn 8 rolls around and I have him at 10 hp with a Dr Boom, Emperor Thaurissan at 5/2, and a Voidcaller on board. He uses Shadow Madness on the Voidcaller, rams it into my Emperor Thaurissan and out pops Mal'Ganis from his hand. He then dropped a Molten Giant for good measure.
One of those moments that's so absurd you just have to laugh. I still won, but man... that was a sick Thoughtsteal/Shadow Madness combo he had.