Hearthpwn

Intro

This is pretty much like a gang-up barnes/golem rogue but with Feugen and Stalagg combo. Definitely a fun deck :)

Gameplay

Barnes has only 1 useless target, but you can adapt your strategy based on what he pulls. Added a Counterfeit Coin so you can play him on turn 3 sometimes. The Evasion is here to stall a turn against a big board or spell onslaught.

https://i.imgur.com/LuU2Hhe.jpg

A typical lucky barnes draw when Stalagg or Feugen is drawn while the other is in hand.

Substitutes

Baron Rivendare is similar to Spiritsinger Umbra. I prefer to setup big turns and then play the double deathrattle instead of playing everything the same turn. Up to your preference. You can also include Edwin VanCleef instead, but it will dilute the Barnes pull. You can also just play a 2nd secret like Cheat Death.

Sonya Shadowdancer works very well with the swarmers, but she seemed kind of weak with so few minions so same as above: Play more secrets.

N'Zoth, the Corruptor can be added for a mid game push with golems or late game push with Naxx Deathrattles. Also dilutes Barnes pulls and you already have Valeera for late game value.

Mulligan

Against aggro removal would be preferable. Mistress of Mixtures, Backstab, Eviscerate, Fan of Knives  against aggro. Only keep Preparation if you have another 2-3 mana spell. Against aggro Bloodmage Thalnos, Preparation, Fan of Knives (and a Backstab) can be game ending.

Against control you can slow down and go for some clunky cards like Jade Swarmer, Beneath the Ground (wonderful vs. Reno and Highlander decks), Barnes (with coin). Spend more time thinking about your late game and what to focus on: Jade or Golems. Also consider that what would be most annoying for your opponent, do you want high health, 4-attack, Deathrattles minions that survive board clears, etc. Save Sap for the huge and expensive targets.

In very long games, try to wait for Valeera the Hollow. Both Feugen/Stalagg can be played twice from hand with the DK power. Same goes for all the jade golem cards, except for Aya Blackpaw.

Noteworthy combo: Feugen/Stalagg after one already died, played twice with Valeera the Hollow. Then next turn double Necrium Vial for 4 11/11s onboard.