Zoo is a staple deck for the Warlock class. The term comes from Magic the Gathering and zoo decks are a mash-up of all sorts of minions without specific synergy other than that they’re small and aggressive. Zoo decks tend to run out of minions as the game progresses so try to save your direct damage spells to finish the opponent. This list is a good starting point if you want to play Warlock Zoo (or Zoolock) but if you get the chance to buy the Naxxramas adventure, its Haunted Creepers and Nerubian Eggs will definately help this deck. Have fun!