When did it work in the first place, I wonder?
We’ll get to that in a moment.
Absolutely. First, why create a topic in the ‘Multiplayer Discussion’ forums when it’s clearly one for ‘Singleplayer Discussion’? Second, have you tried searching or do you think that you’re so unique and special? 
How about something like this?
Some Core cards have changed, but it’s not that important. The idea was to use mostly old cards and cheap or free cards for a returning player like me at that point, and the key elements are all still there, Renathal has been ‘unnerfed’, too.
I’ve not tested it right now, but I’d start with it. The deck was designed after the substantial AI upgrade had made bosses like this harder, so I’d give it a go. As said, the list is not ‘set in stone’, some individual cards can be replaced as needed.