Hearthpwn

Very good deck, only swapped the Ironbeak Owl from the  The Black Knight  due to the very high incidence Sludge Belcher. Since I have not Harrison Jones changed on  Antique Healbot and had it working together

This deck is pure madness, only class I have a hard time with is hunter & sometimes oil rogue.

This deck is very strong but it has some problems vs aggro. Any tips to imporve those match ups (Mech mage, shaman, hunter). Maybe adding chow(s)?

consider adding a taunt card like a Sen'jin Shieldmasta it helps to slow the game down and absorbs a great deal of damage

Coghammer

Yeah I have changed to a more mid range type list, (with Coghammer, jugglers and such) and it has been much more balanced.

You could try replacing Acolyte of Pain with Lil' Exorcist, if you are facing a lot of deathrattle hunters.

Face Hunters are one of the toughest matchups for this deck simply because we don't have taunts and heals until mid-late game, which is often too late vs face hunter. Try to mulligan for cards like Muster for Battle and Belcher. Save your owl for mad scientists. If you can make it to turn 5 and get a Belcher down you've likely won.  If you're facing a lot of face hunters at your rank then consider adding a couple of annoy-o-trons in place of BGH and one of the other late-game cards. 

ya he made an aggro paladin yesterday

What can i replace Dr. Boom with? Is Ragnaros the Firelord acceptable replacement?

Also I only have one Quartermaster, what do you think is best replacement for him?

Rag is good. and You can add an antique healbot for the quartermaster

Nice deck. Can I replace Harrison with a swamp ooze? 

What to replace Sylvanas with? Second sky golem?

You can replace harrison with swamp ooze or Antique healbot. And for sylvanas you can add second sky golem or Cairne.

This deck is pretty insane. I am 8-2 for it so far at rank 4. Easily beat a freeze mage (mech mage was closer) + 2 control warriors so far. The only losses were to a combo druid (I drew terribly) and a control warrior who got super lucky with RNG during the game -- even then he only won because he top-decked Grommash. I ended up crafting Sylvanas and am using an acidic ooze in place of Harrison, which is actually pretty good because it can be a standard 2-drop vs non weapon holders. 

The deck just feels really OP. The best strategy seems to be to just maintain board control. There's no need to race because the deck has so much late-game strength. It's great seeing control warriors top-decking while I still have 3-4 cards in hand!