I am a brazillian player who recently reached legend rank and started messing up with some decks. Since I love priest cards, I tried to figure out a way to counter all the current meta and I finally reached this set. Went from rank 15 to 5 and I if you enjoy I can write up all the details and matchups.
Against Warrior: since pirates are still around, ONLY keep shadow word: pain if you have at least one cleric or one potion of madness. Shadow word: pain, alone, is not enough to release the pressure. With coin, Radiant Elemental + power word: shield is also a good play. Keep Acid Swamp Ooze and Crawler, obviously.
Against Druid: mulligan for both potion of madness and cleric. Dont let him fill the board and do not hesitate to use spells to remove low minions. If it is a Jade Druid, it is not an easy matchup, but always keep resource to remove the Auctioner, such as dragonfire potion, or pint-size + cabal or sw: pain.
Against Rogue: To counter quest rogue, you need an early pressure, so you build up a strong body with kabal talonpriest, pw: shield and, then, inner fire. Potion of madness to take off their minions is very important, specially Igneous Elemental. If is a miracle, save SW: Death to remove early van cleef and at least one copy to remove later arcane giant. Keep Crawler against both.
More info later...
Inner Fire helps with early removals, late game finishers and also a 1 mana spell for for Lyra. That change took me to rank 3 so far