Hearthpwn

Mulligan hard for circle of healing and mass dispel, they are your saviors.

use circle of healing on turn 5 when all enemies are at 1 health, repeat when they go down to 1 health on turn 9, or mass dispel on turn 6. It's important that the enemy's board stays as full as it can, since the other minions in his deck will crush your squishy priest body.

As it turns out, garr's cards are really good against himself (except madder bomber). Mind vision, shifting shade and thoughtsteal are there for this reason. Hope for Rock-out that summons 3 firesworn as this will let you deal at least 9 damage and at most, 27. 

Mind control tech is only in here as a last ditch effort in the case that he gets more than two non firesworn enemies on his board. 

Acolyte of pain is good for drawing cards over time, since he's guaranteed to draw at least two cards.

Eerie statue is among the better cards to use with all the silence synergy and the low cost.

I won after one try with this deck, but I got the dream mulligan of a mass dispel and a circle of healing, so make of that as you will.