Mulligans
General Mulligans
Generally you want to survive until you get your bigger guys out. Lightwell chases aggro off you, Duskbreaker clears, Tortolla is a wall, and Auchenai allows you to ping 2 for 1 mana.
Survive with clears until mid-game then start playing high cost creatures and silencing and stealing opponents while creating your own.
The Archivist + Amber or MC idea is so cool!
But this deck being even cost is a huge drawback. You get so little from your enhaced Hero power and just switching Ysera for Genn gives you much more potential.
I’d add more early game and board clear tools, and make it more control/late game oriented. Still a good idea for us Priest lovers.