After Emperor Thaurissan, use Mirage Caller on Prophet Velen. Then use double Mind Blast or Flash Heal + Embrace the Shadows for 40 total damage. The deck can do a potential 120 damage. In order to do this, you have to use your Shadow Visions to get either Mind Blast or Flash Heal. Once you use Emperor Thaurissan to reduce your combo pieces you can use Radiant Elemental to get Mind Blasts for 0 mana.