Mulligans
General Mulligans
Early game this is a very generally what you are always looking for. Trogg into Totem Golem is one of the best starts in all of hearthstone.
Aggro Mulligans
Against aggro often you are looking for more removal options such as lightining bolt and the aoe of lightning storm.
Midrange Mulligans
Look for your bread and butter cards and try and out tempo your opponent never letting them gain board control.
Combo Mulligans
Simple plan of killing them before they ever get the chance of comboing you.
Control Mulligans
Against control your plan is to gain control of the board to a point where is it almost impossible to stabilize. Flametongue is great for pushing out more face damage or making favorable trades against high health minions.
Midrange Shaman focuses on gaining control of the board early and never looking back. Constantly pumping out threats such as Flamewreathed Faceless , and Thing from Below . The deck excels against slow control starts and can punish aggro with Lightning Storm and cheap Thing from Below
UPDATE: Currently 20-6 with this deck at rank 11