Hearthpwn

The mulligan in this deck is actually easy and almost similar vs all classes.

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
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt (If you have The Coin or another 1-drop)
- Feral Spirit (Only if you have The Coin and a 1-drop)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

[ Hunter: ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt (If you have The Coin or another 1-drop)
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

[ Warlock: ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt (If you have The Coin or another 1-drop)
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)
- Lightning Storm (Keep if you start with 1 Key Card)

[ Paladin: ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt (If you have The Coin or another 1-drop)
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
- Hex (Only if you have The Coin and a good hand - good vs doomsayer) 
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

[ Mage: ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

[ Druid: ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

[ Shaman: ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt (If you have The Coin or another 1-drop)
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

[ Rogue: ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

[ Priest: (Priest in 2016 EleGiggle) ]
Key Cards
- Spirit Claws
- Tunnel Trogg 
- Totem Golem 
Keep if you start with Tunnel Trogg
- Lightning Bolt
- Feral Spirit (Only if you have The Coin and a 1-drop)
- Tuskarr Totemic (Only if you have The Coin and can curve out)
- Hex (Only if you have The Coin and a good hand - good vs resurrect)
Other
- Bloodmage Thalnos (Keep if you start with Spirit Claws)

Against aggro: You have to play as defensive as possible, you really just want to get the board in order to survive. In this matchup you often don't need to get full value of your cards. Normally a card like Hex is really good at clearing a big minion, but in this matchup you sometimes have to use it on just 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 using your Thunder Bluff Valiant in a smart way. 

Against midrange: You have to fight hard for the board in this matchup, and with your 4 AOE clears and a lot of summon minions, this deck is really good to get board control. Sometimes when you get 'the nuts' with Tunnel + Totem Golem etc then you can play it aggressive instead.

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 from adventures. 

- [ Bloodmage Thalnos ]
It's a really good card in this deck, because it works great with Spirit Claws and with all the damage spells in this deck and the card draw is a really nice. If you don't have this card I suggest you replace it with the good old:
[ Kobold Geomancer ] 

- [ Barnes ]
I don't know why, but for some reason a lot of people don't think Barnes is good enough in this deck, but i think it's great in this deck and you need a 4-drop. You can get Thunder, Mana Tide, Flametongue, Bloodmage & Trogg is decent too. Any Totem you get will reduce Thing from Below. Azure Drake can be good if you have Spirit Claws equipped or a damage spell in your hand. So the only 2 really bad card you can get is Tuskarr and Thing From Below, (2/9 chance) But it's still 4/5 stats for 4 mana which is decent. If you're one of the guys who don't like Barnes or just don't have the card, I suggest you replace it with:
[ Flamewreathed Faceless ]