as dk does not exist in twist it should not be possible to get the cards or the hp of that class.
the deck remaind a mage but the hp changed to dk
Just happened to me. I guess it’d be the same if we turn into Demon Hunter although I have not tested if it was possible.
In my case, my hand got emptied as I had only warlock cards in it and when I played Renounce Darkness. My deck still contained cards (I don’t know of which class because I did not have the chance to draw any).