Zoo Warlock or Zoolock is one of the most popular archetypes in the history of Hearthstone. It utilizes low cost minions, and the ability to continually draw cards via the hero power to constantly push minions onto the board. While the deck is commonly referred to as Aggro, it’s important to note that it cares al ot about the early board control. It uses efficient trading to hold onto the board and beat up the opponent once its in control.
With Heal Zoo rotating out of Standard, the deck went back to its roots again, adding even more small minions and playing a board flood style of game. New cards like EVIL Genius or Magic Carpet improve this kind of play style quite heavily.