Hearthpwn

I have called the most important cards 'Key Cards' to make it easier to understand, but the Key Cards are some you need to KEEP

[ Warrior: ]
Key Cards
- Fiery War Axe
- Bash 
Keep if you start with a key card
- Slam
- Ravaging Ghoul
- Elise Starseeker
- Bloodhoof Brave
Keep if you have 1 key card and 1 'keep if' card
- Justicar Trueheart 

[ Hunter: ]
Key Cards
- Fiery War Axe
- Bash
Keep
- Slam
Keep if you start with a key card
- Acolyte of Pain
- Ravaging Ghoul
- Bloodhoof Brave (Or if you have The Coin)
Other
- Shield Slam and Shield Block if you have those cards together in your mulligan.

[ Warlock: ]
Key Cards
- Fiery War Axe
- Bash
- Slam 
- Ravaging Ghoul
Keep if you start with a key card
- Acolyte of Pain
Other
- Shield Slam and Shield Block if you have those cards together in your mulligan. 
- Bloodhoof Brave (If you have The Coin AND Fiery War Axe)

[ Paladin: ]
Key Cards
- Fiery War Axe
- Acolyte of Pain
- Slam 
- Ravaging Ghoul
Other
- Bloodhoof Brave (If you have The Coin AND Fiery War Axe)
- Bash (if you have Fiery War Axe , Slam or The Coin)

[ Mage: ]
Key Cards
- Fiery War Axe
- Bash
Keep
- Slam
Keep if you start with a key card
- Acolyte of Pain (Included Slam)
- Ravaging Ghoul
Other
- Shield Slam and Shield Block if you have those cards together in your mulligan. 
- Bloodhoof Brave (If you have The Coin AND Fiery War Axe)

[ Druid: ]
Keep
- Fiery War Axe
- Acolyte of Pain
- Slam 
- Ravaging Ghoul
- Acolyte of Pain
Other
- Execute (if you have slam or ravaging ghoul without having Fiery War Axe + Slam). If you have Fiery War Axe + Slam you won't need execute for their 3/5 in the early game.
- Shield Slam and Shield Block if you have those cards together in your mulligan. (To deal with their 3/5) 

[ Shaman: ]
Key Cards
- Fiery War Axe
- Bash
- Ravaging Ghoul
Keep if you start with a key card
- Bloodhoof Brave (AND The Coin)
Other
- Slam (if you have Fiery War Axe or Execute)
- Execute (if you have 2 Key Cards or 1 Key card + Slam) 

[ Rogue: ]
Key Cards
- Fiery War Axe
- Bash
- Acolyte of Pain
Keep if you start with a key card
- Bloodhoof Brave (AND The Coin)
- Elise Starseeker (AND The Coin)
Other
- Slam (if you have Fiery War Axe or Execute)
- Execute (If you have Slam or Ravaging Ghoul)
- Ravaging Ghoul (if you have execute or The Coin + Acolyte of Pain)
- Shield Slam and Shield Block if you have those cards together in your mulligan.
- Shield Slam (if you have The Coin + Bash)

[ Priest: (Priest in 2016 EleGiggle) ]
Key Cards
- Fiery War Axe
- Bash
- Slam
- Elise Starseeker
- Justicar Trueheart (because priest is so slow atm)
- Bloodhoof Brave (good early before they can use Cabal on it)
Other
- Shield Slam and Shield Block if you have those cards together in your mulligan.
Execute (if you have any execute activator like Bash, Slam or Fiery War Axe)

Against aggro: You have to play as defensive as possible, you really just want to survive. In this matchup you often don't need to get full value of your cards. Normally a card like Shield Slam is really good at clearing a big minion, but in this matchup you sometimes have to use it on a 3/2 in order to survive.

Against control: You have to play as slow as possible. You should seek to outvalue your opponent. In this matchup you will need to get full value of your cards and always be aware of fatigue. Normally a card like Bash is really good against aggro, but in a control Warrior mirror you sometimes have to use it on their face in order not to overdraw.

Against midrange: You have to make a mix of "against aggro" and "against control". Midrange is the hardest matchups, because you have to slow them down in such a manner, that you are still able to maintain value in the long game. Let us say you play against a Zoo, and he has a 2/3 Imp Gang Boss, then it can in certain situations be worth to Execute it, in order to avoid getting too far behind, even though execute would be better off on a Doomguard or something of that size.
You must estimate whether you need full value of a card to stay in the game longterm or quick removal of your opponents aggro resulting in diminished card value. Being able to shut down your opponents pressure early/midgame and staying in the fight throughout the whole game is the balance that you must find to master this matchup.

First I want to stress that I really don't recommend replacing any single card in this deck, but these are the replacements you can make if you're forced to.
If you're missing any other cards than those listed below, I strongly suggest for you to venture out and find another deck, because the possibilities of this deck and the ranks you're able to reach with it are very diminished when you're missing too many vital cards. I expect for you to have cards like Elise Starseeker and Revenge from adventures. 

- [ Grommash Hellscream ]
It's really hard to replace because it's a vital mean of removing minions such as Azure Drake, and then you can suddenly setup unexpected lethal, since you already use cards like Gorehowl and Bash. This strategy is especially important against Reno Warlock, when they use Lord Jaraxxus. If you don't have the card I suggest you replace it for Ragnaros the Firelord, but if you can manage to gather the dust needed to craft him, he's the most important of the 4 listed cards in this bracket.

- [ Tinkmaster Overspark ]
Can be replaced by Spellbreaker because it can be used on minions that need their effect to be denied, but Tinkmaster is better at dealing with C'Thun, Stealthed Gadgetzan Auctioneer & dealing with big minions such as Deathwing.

- [ Harrison Jones ]
Can be replaced by Acidic Swamp Ooze because it can remove weapons aswell. In some matchups you don't want to draw, which can make it better and against fast decks like Dragon Warrior it can be good to stop their tempo. I still prefer Harrison Jones because of the draw and body.

- [ Baron Geddon ]
Revenge has the most important part of Baron Geddon, but doesn't quite do the trick. You will be missing the body which isn't the worst part, but Geddon is so much more reliable for the 2 damage AoE whereas Revenge might only do a single damage. 

Coming soon!