Mulligans
This is a straight up Dragon deck, which provides a good curve and solid minions for Priest to leverage on board.
Book Wyrm is a better Cabal Shadow Priest, and Netherspite Historian a better Museum Curator.
I’ve enjoyed playing Dragon Priest for quite some time and I think this deck is in a good position in Standard.
It’s debatable how many shadow word pain/death s you need, depending on what you’re facing you could throw in an Excavated Evil as well, and the bomb Dragons aren’t set in stone, just the ones I enjoy.