Hearthpwn

I made and refined this deck several times, with several wins in order to give the best results. I may update it in the future, but you will get an easy win with this deck. 

How to Win: Rend will always coin his hero ability. Always starting with "Summon three 2/2 welps". You should then mulligan for Mad Scientist, Explosive Trap, Doomsayer or Explosive Sheep. 

          On Rend's second turn, he will likely use his hero ability again, most likely "Summon two 2/2 orcs, with Taunt" or "Summon a 5/4 dragonkin". He will always use his hero ability before attacking. So If you have Explosive Trap, you are guaranteed a board clear, without any damage. If you have an Explosive Sheep, he will attack the sheep last. If you have made scientist or Doomsayer, he will ignore them completely. 

          After the initial two turns, it is only the matter of having a good turn 3 mana minion. Anything will do, do not be afraid of playing a bare Mind Control Tech, you need that board presence. Playing Cult Master on turn four is okay as well. Also, you will find yourself running out of cards faster than Rend, since he relies heavily on his hero ability. If you can stabilize by turn 4 or 5, you will likely win. After wards, it's just a matter of playing your big cards and saving Big Game Hunter and Hunter's Mark for his big minions. 

Gladiator's Longbow can be used for damage or clearing. Stormwind Champion is a big, non legendary minion, that synergies' with Unleash the Hounds. Faceless Manipulator is just to copy a big minion to save mana, this card can be replaced if you like. 

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Replacable cards: I noticed from my previous guides that some people cannot afford certains cards or like alternatives. Here are some of my recommendations. 

Grim Patron isn't actually that amazing and can be replaced, but it is a fun to run. Quick Shot also can be replaced with any kind of damage.                                   Gladiator's Longbow can be replaced damage, such as Kill Command            Molten Giant can be alternated with any big non legendary, ex. Piloted Sky Golem

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Rend Blackhand's Deck: I am only listing the more notable cards for now*

         Rend has a card called "the true warchief", which destroys a legendary minion. I do not recommend replacing any card for a legendary. Rend runs a lot of dragons/dragon related cards: Azure Drake, Blackwing Technician, twilight welp, Twilight Drake. The spells that annoyed me most were, Rampage, Mortal Strike 

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A little about me: I am a 3x Legend player, more on the casual side now. I like to make outlandish decks. Feel free to check them out. I will make a deck for every heroic Blackrock Mountain boss.