Try this DEMON Control Warlock

Been so tired of the same control warlocks on ladder so have been tinkering with this demon heavy version and not only has it been a lot of fun, but also pretty successful ~65% w/r over 20 games

I've created a video guide showing all the mulligan tips, strategies, combos, win conditions as well as my verdict of the deck

So give it a try

and as always have fun and good luck on ladder