Mulligans
General Mulligans
If you get Crystology in your opening hand, you're golden. Other than that your main targets are going to be Paragon or Stonehill. Don't be afraid to drop a prelate with no buff to make your opponent get rid of it in the early game, if they silence it then you've committed nothing to that Prelate so it isn't a huge loss and if they kill it it doesn't really matter in the long run.
The idea is that you use Call to Arms, Crystology, and Witchwood Piper to fetch your Immortal Prelates out of your deck consistently. You buff them as the game goes on, and use buffs as needed on Paragon of Light to stay alive. Turn 5 Paragon of Light into Sound the Bells! works well (although it is a bit wasteful). Essentially you want to use lifesteal and heal cards until you can get to turn 7-10, and from there you can start to have a lot of fun buffing your Immortal Prelates up and playing Templars when needed.
A strange thing I’ve found while playing this is that it beats most Hunter decks. if you drop a Paragon of Light and buff it there isn’t much a Hunter can do about it beyond Candleshot and Hunter's Mark. Along with this, a turn 6 Immortal Prelate into Blessing of Kings is very difficult for a Hunter to deal with.
Requirements: You don’t really NEED Lynessa Sunsorrow but she is a good finisher in a late-game matchup. The quest is more required, as Galvadon is really good for ending the game, but the legendary you really need is Shirvallah, the Tiger. That card has saved so many games it’s not even funny, and with Flash of Light, Lay on Hands, and Shirvallah you can heal for 19 in a turn and draw 4.