This Midrange Shaman Counter Zoolock Build is one way to shut down the large amount of Shaman on the ladder right now. There are lots of cards that allow you to value trade up to keep pace with all the value cards in the Shaman deck. There are no overload on these however, so you can start to pull away on value and get an upper hand.
There is loads of synergy with Knife Juggler to snipe off units. As well as a Flame Juggler hitting the target you want. Use Dark Iron Dwarf and Abusive Sergeant to uptrade and leave a body on board.
You have burst to match the midrange Shaman deck too with Leeroy Jenkins, Power Overwhelming, and one copy of Soulfire.