Secret/Tempo Mage i've played on todays stream (05/04/2017)

Main concept is, to gain bord control with your cheap minions, then use the damaging spells either to remove their stuff - while your guys keep attacking, or if his life is already low just burn their face.

priority #1 in the mulligan are Kabal Lackey, Mana Wyrm and Arcanologist.

Good Luck!