This is the Sjow Discardlock Deck w Malchezaar’s Imp he was playing on 
stream after the new card Malchezaar’s Imp was released.
Discard Warlock decks are going to developed over the coming days with all the discard synergy cards now released. Warlock was already is a decent spot, so the added card draw and synergy from discarding is going to strengthen the class.