Blue priest, i still feel that the deck lacks important aspects that my lava rush deck does not.
He lacks survivability, yea the ai3 may have creature control and stall tactics and that would ultimately beat him. My deck however can throw golems who can take a lightbolt, can stop shields, can even grant me an extra turn on turn 1, even have creature control or golem buffers.
Each card that i have in my deck has won me a game only because of the card.
Miracle, divine glory, and paradox all fell due to silence.
Osirus, ferox, and chaos lord all fell due to rage potion.
Seism and dark matter all fell to cremation.
Hermes, decay, octane, and neptune all fell to heavy armor.
Dream catcher, firefly queen, and rainbow all fell to the sheer speed and brute force of my deck.
and finally, obliterator and that aether god (cant remember name) fell to explosion.
The one deck that I cant beat is probably minor phoenix although i have had fluke wins over him.
I know a thing or two about cremation decks, its all about speed and versatility. Your deck lacks both. Add some CC and golem buffs