Mulligans
Aggro Mulligans
Happy Ghoul, Spirit Lash and Potion of Madness are your top picks.
Radiant Elemental is great with Power Word: Shield, and can also be very strong with Potion of Madness.
You can keep Kazakus in certain matchups because of the strength of a turn 4 Kazakus into turn 5 potion, or turn 5 Kazakus + 1 mana potion.
Control Mulligans
Consider keeping Northshire with PWS or Divine spirit. Card draw is this deck biggest weakness vs control.
This is not an OTK deck, but a value deck with burst potential.
Card draw is this deck biggest weakness vs control, så play your cards conservatively.
The deck uses combos from cards like Radiant Elemental + Lyra the Sunshard , Raza the Chained + Shadowreaper Anduin and Circle of Healing + Auchenai Soulpriest or Northshire Cleric.
The combos are supported by Burgly Bully , Mukla, Tyrant of the Vale and cheap spells.
You also have the great value and swing from the potions and packs from Kazakus and Elise the Trailblazer.