Hearthpwn

First of all, Reno Jackson is not required in this deck. It can be replaced by Acolyte of Pain or Shadow Word: Horror.

Strategy

Draw as many cards as possible in early rounds with Northshire Cleric and Acolyte of Pain, but be careful not to overdrawn cards, you can sacrifice one Northshire Cleric if necessary, so never put two Northshire Cleric in the battle at the same time.

Early Game

With this deck, it is absolutely critical to have to have Northshire Cleric and Shadow Ascendant in your hand in the 1st round of the game. So here you can cheat a little by RESTARTING the game until you have these cards. 

Play  Northshire Cleric in your 1st round and then Shadow Ascendant in the 2nd round. With Hero Power Lesser Heal it is almost guaranteed that you will gain board control and start to get cards you need in late games.

Tips

Lich King will certainly play Frostmourne when it gets 7 mana, so make sure you have Shadow Word: Horror in your hand by then.

Late Games

By using [card]Divine Spirit [/card] and [card]Inner Fire [/card] and Taunt, you are pretty much invincible in late games.