There have been a decent number of various types of Zoolock decks in the past. Most of them were focused on buffing demons. But this new iteration lets you buff any types of minions.
Consider such new cards like Scarab Egg and Grim Rally. You can play the egg and immediately destroy it on turn three. As a result, you will have three 2/2 Scarabs on board for just three mana. But this is not the only combo you can achieve in this Zoolock variant.
Try to play the Spirit of the Bat early in the game, and don't be afraid to trade and tap at the same time. This will activate the buffing engine of the spirit, which turns out to be really effective.