Mulligans
The main goal of this deck is to use Prophet Velen in combination with the mind blasts to OTK your opponent. In order to get to your OTK turn you want to draw as many cards as possible to get to your OTK turn quicker. Meanwhile play play as a control priest and survive until you can kill your opponent with the combo. With Emperor Thaurissan you want to atleast discount a Radiant elemental, Prophet Velen or 2 mind blasts otherwise the OTK is impossible. Also use the shadow visions to dig for your mind blasts because you need 3 of them for the OTK to work.