I don’t have much faith in Control Warlock decks. If Gul’dan cannot play defensively, he needs to abuse Life Tap early as much as possible, and the other Warlock archetype that can do that is Handlock.
Handlock got some very strong enablers that came from neutral cards in this set. The silence package got much stronger and more consistent with Arcane Watcher and Dalaran Librarian joining Ancient Watcher. Faceless Rager is also an excellent card in the deck since it has so many high health targets. The rest of the build is very defensive and lean, with not a single card meant to cost more than 5 mana. However, this doesn’t mean Handlock can’t have a strong late game, and this is where Barista Lynchen comes in. Not only does this deck contain many battlecry minions she can copy to a great benefit, but her interaction with Omega Agent on turn 10 is particularly sick. It allows the Warlock to keep pressuring the opponent seemingly forever with up to 5 waves of Omega Agents. That’s quite a handful for any deck.