Mulligans
With Zoolock loosing a lot of essential cards, most notably Implosion and Haunted Creeper, a new decklist must be born. Luckily with new efficient cards such as Possessed Villager, and new synergies with Darkshire Councilman, Zoo will more than likely still be in a good place. Renounce Darkness allows you to replace your low cost minions such as Voidwalker and Flame Imp in the late game with more efficient minions, still having synergy with your neutral cards.