Hearthpwn

This Priestdeck is strong vs Mech and Aggrodecks and works pretty well in lategame Matches as well. (managed to get to rank 5 with it, potential to legend)

You got early clear with Holy Smite and Shadow Word: Pain and later on with Shadow Word: Death.

The Strategy with this Deck is simple but effective, with Mulligan you try to get early clear like Smite or SW:P and a Northshire Cleric and then u outlast your opponent through heal and buffing until you beat them. Make sure you trade well because you have no silence (see card options) and don't be affraid to use Inner Fire as a Debuff instead of a Buff.

Card options:

Acidic Swamp Ooze can  be swapped with a Silence if you feel you need to i recommend Ironbeak Owl or Spellbreaker because of your Boardpresent.

Temple Enforcer this card can be swapped with any highcost Legendary if you posses them and what lategame effect you want to have with your Deck:

Control: Sylvanas Windrunner, The Black Knight or Dr. Boom

Dmg: Ragnaros the Firelord or Foe Reaper 4000

Changes after several more games:

1. If you don't have a Lightbomb just go with a second Circle of Healing

2. If you face many aggrodecks change the Shadow Word: Death into a      second Circle of Healing or a second Swadow Word: Pain

3. Swap the Acidic Swamp Ooze with a silence like i mentioned above.

If you have suggestions or questions pls leave a comment, thx ;)