Mulligans
If you’re going to play a high-rolling deck, you may as well high-roll as big as you can. Use Barnes and Shadow Essence to pull powerful minions from your deck early, and then revive any deathrattle minions with Eternal Servitude and Onyx Bishop.
The deck can be a little more finicky than the standard Big Priest decklists, but not by much. Plus, the added late-game value from N'Zoth, The Corruptor and Amara, Warden of Hope can really swing the game in your favor against other heavy control decks.