Mulligans
The main idea of this deck is centered around using lots of spells which combination of Hamuul Runetotem increases your hero power which creates large minions.
With using sing-along buddy, late game you can summon 2 very large minions and you want to make sure after you can create say 5/5 that you are using your hero power each turn.
By turn 7-10 you should have a large board to overwhelm your opponent.
Video Gameplay Breakdown:
https://youtu.be/RauEVeADdHU