Mulligans
General Mulligans
Get secrets, Spellstone, master's call, and Rexxar
Aggro Mulligans
Secrets, Spellstone, Flanking Strike, Unleash. Rexxar to refill on value.
Control Mulligans
Get your beasts in your hand ASAP while also playing spell hunter things. When that runs out, Rhok'Delar and Rexxar. They may be dead cards until you run out of beasts, but they help you get that final push.
Use secrets in the early game. Draw out your beasts with Master’s Call, use Oondasta to summon your Charged Devilsaur or King Krush. When they die, use Revenge Of The Wild to summon them back. And when your deck is free of minions, use Rhok’Delar to refill on value and go infinite with Rexxar.
Note: Depending on what Zul’Jin is this may be improved when he’s revealed.
EDIT: AND Zul’Jin is just PERFECT for this deck! In he goes.