Hearthpwn

Hello!

I used this deck to defeat heroic Sapphiron, there is really not too much to it. On heroic, you have no Frozen Champion for your dudes to hide behind, which results in the boss wiping your board at the start of his every turn, so the only minions included in the deck are the parts of the Unleash combo, Mad Scientist to bring out more traps, Nerubian Egg is 4 damage for 2 mana against the boss, which is alright.

Use your hero power often, but do not let the boss overwhelm you on board. Mind the Skeletal Smith if you have or you are about to play your Eaglehorn Bow. When the enemy minions are becoming too much of a threat, you can abuse the Necroknight drawback to regain control - and to kill annoying minions such as the Spectral Knight. Hunter's Mark goes a long way in this regard.

Save your UtH combo cards - Starving Buzzard, Unleash the Hounds, Timber Wolf - for when you can get good value and good damage to the face. You should be aiming to gnaw at the boss for a bit with your hero power and bow, manage the board, then go for the kill in two large bursts over two turns - UtH + Wolf, UtH + Wolf + Leeroy, 2x Kill Command and such. 

Misdirection felt like *the* MVP here - don't place it blindly if you have the choice. It can save you a ton of life and cripple their board, or at least get you closer to the kill range.

Another good thing about traps is that Sapphiron always plays his minions before he attacks, from what I've seen, so those Explosives will be juicy.

Mind that the boss also has Pure Cold in it's deck in addition to the less threatening Frostbolt and try not to get caught with your pants down when planning trap placement or trading your hounds.

If you have no Leeroy Jenkins, you can replace it with an Arcane Golem for example, it'll still be a viable deck! You can even run the Golem instead of the Explosive Shot if you are feeling kinky or just don't have this less-used rare.

Good luck, hopefully you find this decklist helpful on your way to the Naxx card back!

- Sisyfos

 P.S. Contents of the Sapphiron Heroic deck, according to Beonitas. Thank you for the contribution!

 P.P.S. A video of the deck in action by Kizaru1, thanks!

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Thank you all for the wonderful support, I didn't dare to imagine this would become so popular. It's great to see I've hopefully helped all you nice people, very motivating.