I was wondering why I was seeing so many warlocks all of a sudden.
I just got Mal'Ganis as a drop for my 3rd legendary card, and coincidently was trying a demon based warlock just to get some use out of it, not knowing it was currently a fad.
Though my version was absolutely terrible. I thought maybe 2 Sense Demons cards with only a void caller and Mal'Ganis would be an ingenious play, but turns out that was really dumb. I think I learned that cards that draw cards are mostly only worth it if you're willing to give up significant early board control, but that combo only really works if you have some semblance of mid game board control.
I ended up turning the deck into a burstlock, with cards like Reckless Rocketeer to supplement the power overwhelming and darkbombs and the like, which worked great against all these weird Warlock decks. Felt really smart about that, but I'm still new and only rank 17 so take that how you will.
By the way, I think Reckless Rocketeer might be a surprisingly good card in the meta right now. No one ever calculates for that 5 damage coming from out of no where.