Hearthpwn

This could be an intended interaction and i don't know if this is common knowledge already, but it appears if The Dark Wanderer transforms into Ragnaros through Majordomo Executus, he will not be able to become the Cow King. I'm presuming this would happen as well if your opponent somehow got their hands on a Lord Jaraxxus.

Basically what happened was, that i had revealed two of his secrets. He used Mind Games, stealing my Executus. I killed it, turning him into Ragnaros. I could've killed him too, but i kept him alive as i was attempting to go against the Cow King. Later on in the game, the third secret was indeed revealed as well, however, nothing happened. The effect of the secret was activated, however, he did not transform into the Cow King. No Enigmatic Portal appeared, no Twisting Nether? was used. Absolutely nothing. Instead, the game continued normally with him as Ragnaros.

One last thing is, that as shown by the image attachment, the game didn't even record the 3rd secret ever being revealed.