Hearthpwn

Equip Doomhammer.
If your Doomhammer is broken, use Hoard Pillager.
On 10 mana play Zephrys the Great and get Inner Demon to deal 20dmg final turn.

Played this deck from D3 to Legend in April and from Bronze to Legend in May.
Winrate: 60-70%
100% wr vs priests. (~20 games)
Weak vs Highlander Hunter and Bomb Warrior.

Cards choice

Required cards:
Highlander package: Zephrys the Great, Dragonqueen Alexstrasza
Galakrond package: Galakrond, the Tempest, Kronx Dragonhoof, Shield of Galakrond, Corrupt Elementalist, Invocation of Frost, Devoted Maniac, Dragon's Pack
Board clear: Earthquake, Hagatha's Scheme, Plague of Murlocs, Lightning Storm
Healing: Walking Fountain, Witch's Brew
Combo finisher: Doomhammer, Hoard Pillager
Other: Alexstrasza

Personal choice:
Target spells:
Torrent, Hex - strong and effective removals
Serpentshrine Portal, Earth Shock - amazing flexible cards
Lightning Breath - 3 mana Flamestrike. Easy 6 dmg aoe with Bloodmage Thalnos and Wrath of Air Totem
Reactive minions:
Siamat - good card in any situation
Faceless Corruptor - can be used against either one big minion or two small
Shattered Rumbler - not a bad card. Works for me.
Card draw:
Mana Tide Totem - can draw multiple cards and save 3 hp to your hero
Far Sight - mana cheating, activator for Shattered Rumbler and Torrent
Big Ol' Whelp - good stats, activator for Lightning Breath
Bloodmage Thalnos - all you need in one card.

 Other good options:
Acidic Swamp Ooze - good in current meta. But priests can steal it to destroy your Doomhammer
Marshspawn, Cobalt Spellkin - good overall. I didn't find a place for them
Bandersmosh - cool card. I just don't want to craft it
The Lurker Below - could be better than Shattered Rumbler. I just don't want to craft it