Hearthpwn

The purpose of this deck is to grind your opponent out of resources and to take them to fatigue. Expect games to be drawn out & excruciating for your opponent. This is why there is hardly any burn in this deck, since it is not needed for the win condition.

Against aggro you are going to want to have your duplicates land on Belchers, though sometimes you will need to expend them on Deathlords if your draw is bad. This is one type of match-up where you are simply trying to outlast your opponent before killing them with incremental face damage. 

Against control you want your duplicates to land on your Deathlords if possible since they will drastically help thinning your opponent's deck so that they begin fatiguing long before you.

Dropping N'Zoth to land a ton of Deathlords/Sludge Belchers is one of your main plans for this deck since it will extend the game to go on longer until your opponent reaches fatigue, as well as further thinning the opponent's deck by bringing back more Deathlords.

Strong combos:

Thaurasian reduce Brann + Coldlight + Manic Soulcaster: Great for speeding up the fatigue burn for the opponent. Also great for burning key cards in combo & control decks.

Thaurasian reduced Brann + Healbot + Soulcaster: Prevents you from taking fatigue and extends the stall plan even longer. Great survival tool.

N'Zoth + Soulcaster next turn: If you are really going toe to toe with something like Control/Reno Priest or Control Lock and your N'Zoth lives a turn then this can really turn the tide against control decks  as they will need to clear a full board multiple times, all the while thinning their deck in their process.

Doomsayer + Frost Nova: Classic Freeze Mage board clear.

Possible Additions to the Deck:

Frost Lich Jaina: I don't have her personally so I can't test her out in the deck, but it seems like a possible good addition as it adds slightly more removal & a lot more survivability if you can land a lot of elemental pings.