Hearthpwn

First of all, everyone wants to play a deck with the least polarization and also not too hard to pilot. Even Warlock can serve both requirements. The meta is filled with all 9 classes and it is really hard to counter all decks. With even lock, you have a range of cards from 2,4,6,8,10 mana so that you don't have to worry about the matchups.

I will list out all the choices of cards I made in this deck.

Acidic Swamp Ooze: A basic card which destroy a weapon and has a body 3-2. It totally destroys Odd Rogue buffed weapon, Twig of the World Tree, Necrium Blade, Skull of Man'ari,... All of the classes except Priest and Shaman use weapon to gain tempo and take advantage of the effects==> Ooze is the real deal right now!

Defile: No more words. A powerful AOE tears zoo decks apart. It is considered as a Silence all+ Twisting Nether if used correctly.

Demonic Project: An anti-combo card. It can transform Malygos, Toggwagle, Shudderwock,... into a demon so that they will scream in agony. Be careful that it might give your opponent useful demons such as Doomguard, Lord Jarraxxus and that will surely screw you.

Gnomeferatu: Discard the opponent key card is its main function. A tip against Mechathun Priest is that after they Helmeted, you can play Gnome to discard there key combo card and make them concede. XD

Plated Beetle: A solid 2 drop with 3 additional Armor. It will save you from being SMOrced by aggro and help you control early game.

Sunfury Protector: Giant turn 3 and 4 is ideal. Besides them, you can buff taunt to any minion to survive damage. Remember to buff the correct minion so that the desired minion will be protected.

Vulgar Homunculus: A 2 4 body for a 2 drop is massive. The 2 damage is not a big downside since it synergies with Lesser Amethyst Spellstone. Taunt tag denies 4 face damage so that you can plan further.

Hellfire: Solid AOE. It is mainly used to counter aggro. On the other hand, you can find lethal or combo with Defile and Spellstone based on your situation.

Hooked Reaver: A 4 mana 4 4 is kinda bad to be played on curve. But, when u are at danger, a 7 7 with Taunt can save your ass. When revived by Guldan, he doesn't have Taunt but surely he is on the board and can gain the tempo back.

Lesser Amethyst Spellstone: 3 heal is definitely not the heal we want. Synergy with the mentioned cards, this spell can go up to 7 Damage and heal for 7. If we somehow can control a Spell Damage minion or spell, we can increase both the damage and the heal.

Shroom Brewer: Instant heal for the minions and your face. The body 4 4 is the sacrifice of 1 Health for 4 Heal. You should check whether Hooked Reaver effect is triggered or not before healing.

Spellbreaker: A tech card to silence early threat like Devilsaur Egg, Spider Bomb or other annoying Taunt minions. The body 4 3 is also not too bad.

Twilight Drake: I put only 1 copy of this dragon since we need to demonic project. The Dragon Health is the target forSunfury Protector and 4 damage can leave scars on opponent face.

Dread Infernal: A 6 6 body with the anti-Paladin effect. The Spellstone can be upgraded by the effect. Guldan can also bring this dude back to life and continue fighting.

Genn Greymane: Uhm, if he is not in the deck, then who will? Baku?

Mossy Horror: An anti-Druid card. He terminates Spreading Plague and also bunch of Saronite Chain Gang. Use him wisely so as to not hurt your own minions.

Siphon Soul: Removal and Healing in 1 card. It delivers Edwin van Cleef and many big buddies to the graveyard.

Skulking Geist: This 1-eye maestro removes many key cards of your opponent. Hunter cannot Tracking, Rogue cannot Deadly Poison, Druid cannot Naturalize, Warrior cannot Shield Slam,... Let's play him ASAP and wait for your opponent to rage.

The Lich King: He is big. He has Taunt. He gives you an instant value. Death Grip can steal Shudderwock, Death Coil can be played strategically.Frostmourne can SMOrc 15 damage or give you 3 free minions, Doom Pact is fantastic when reaching Fatigue, Army of the Dead is the least trusted card but if the deck is tracked, you can optimize it.

Twisting Nether: It destroys everything on the board. Although deathrattle minions cannot be cleared 100% but we can trade efficiently before sending all of them to the Nether.

Bloodreaver Gul'dan: This card is another important piece. 5 Extra armor and reviving all demons that died this game from Vulgar Homunculus to Dread Infernal not only giving you board but also equipped you with one of the most powerful HP: Siphon Life.

Mountain Giant: A big and terrifying card to be played on turn 3 or 4. Its massive body help you to trade off minions early game or just simple as dealing 8 damage to op poor face. Remember that you cannot Coin and play Mountain Giant.

1. Druid:
     Togwaggle Druid: Their core strategy is swap with your deck. you need to apply early pressure to lower their health before they can counter big minions with Naturalize. Skulking Geist is the MVP since he potentially clears 4-6 spells in the deck, let's play him ASAP. 
    
     Malygos Druid: This matchup is kinda intensive when u need to take care of your Health not to go lower than 15 so that he cannot Maly and OTK you. Use your Demonic Project after he played Florist so you can have a chance of turning Malygos or Flobbidinous Floop to demon. Remember to play around Spreading Plague so he cannot make use of Branching Path attack.
   
     Token Druid: I rarely face the archetype but this is the easiest matchup we can have. Just clear his bunch of Wisp by Defile, Hellfire and Mossy Horror. Destroy Violet Teacher by Spellstones and you should have ez time.
   
   Mulligan: Skulking Geist, Mountain Giant, Twilight Drake
2. Rogue:
     Miracle Rogue: This is a really hard matchup if we don't have enough control early game. Hench Clan Thug and Faldorei Strider are really annoying to deal with. Her Sap collaborates with Leeroy Jenkins and Cold Blood and will hit us very hard. Try to maintain the board and don't allow her to spread the board.
   
     Odd Rogue: The 1 drops are hard to counter. We should control the board early game to make sure they cannot set up for Mushroom Power( Mr. Fungalcancer). The Vicious Fledgling and Hench Clan Thug is the main target to remove early. Control the board until we can comeback with the Hooked Reaver and the Taunts from Sunfury Protector. Keep in mind that with Coin when going 2nd, she can play Vilespine and snowballing.
   
     Kingsbane Rogue: When we face this deck, we must apply pressure as fast as possible. Throw your minions out and push damage to the face so she does not stand a chance of refueling with Kingsbane lifesteal.
   
     Malygos Rogue: When facing this deck, after they have played 2 Elven Minstrel, they will surely have Maly or Kobold in their hand. Just Demonic Project and feel their salt.
   
   Mulligan: Vulgar Homunculus, Lesser Amethyst Spellstone, Acidic Swamp Ooze
3. Shaman
     Shudderwock Shaman: This matchup is a race against the clock. You should get the big guys out early so that you can push damage. Playing around MCT is essential if you don't want your giant stolen. Demonic Project should be played after they have played all the combo pieces like Chaingang, Grumble, Zola and Lifedrinker.
    
     Even Shaman: You must control the board via Vulgar Homunculus and Gnomeratu. Twilight Drake and Shroom Brewer are important 4 drops in this match. Use AOE wisely to destroy his elementals so that he cannot buff the +2/+2 for Elementals.
   
   Mulligan: Gnomeferatu, Twilight Drake, Shroom Brewer, Mountain Giant.
   
4.  Mage
     Big Spell Mage: This face-off is kinda hard since they have Polymorph for our Giants and Dragon Fury to clear our board. Play as optimal as you can, bring Giant and big boys out early and baiting removal time to time. Just be patient and you can improve the win rate of this mathchup.
    
     Hand Mage/Hand Elemenatal Mage: They consist of elemental synergy with very good tempo control since the deck is filled mainly with minions. They also have Giant and DK Jaina so let's finish the match early and gain the maximum tempo so they cannot heal back in the late game. Meteorologist can be played and some guys can even bring Arcane Keysmith so you should also play around Secrets.
   
     Aggro Mage: We can handle them easier since the nerf of Mana Wyrm. They cannot snowball us from turn 1. Gnomeferatu is needed to delete such Aluneth and many more, Shroom Brewer and Hooked Reaver is important to be kept.
   
   Mulligan: Gnomeferatu, Hooked Reaver, Mountain Giant, Shroom Brewer.
   
5.  Priest
     Zerek Gallery Priest: This deck with good cards like Radiant Elemental early game can play high cost spell and bring out big dudes like Velen and Malygos, your health can be burst from 20 with Velen/Maly and 2 Mind Blast so be careful not to go too low. Giant should be played early to crush his face.
   
     Mechathun Priest: This matchup is easy if we have Demonic Project in our hand early so we can wait until the 5 combo pieces remain and we transform 1 into a Blood Imp.
   
   Mulligan: Mountain Giant, Twilight Drake, Hooked Reaver
   
   
6. Warlock:
     Control Warlock: It should be ez in this matchup if you are able to play the Giant out since he cannot deal with a turn 3  8 8. Otherwise, try to play the ooze when he plays Skull to deny him from hacking mana. Play around Defile is another complex things because he can play Kobold Librarian and set up for the ultimate clear.
   
     Even Warlock: Mirror matchup depends on who manage to get the big target out first. Trade efficiently and try to burst his face with x2 Hellfire and go for the face.
   
     Zoolock: This is favorable since we have Defile to beat his army in a single turn. Don't be too greedy with the AOE unless you want to commit sudoku. XD
   
   Mulligan: Moutain Giant, Vulgar Homunculus, Gnomeferatu
   
   
7. Hunter
     Midrange Hunter/Secret Hunter: These decks can burst us really fast if we don't have enough tools to counter. Clear the board and try to create a huge board in case of he plays Deathstalker Rexxar. Our Bloodreaver Gul'dan is a key player against Hunter because he can swing the tempo and siphon your opponent to death.
   
     Egg Hunter: Unfavored matchup since turn 1. Don't allow him to trigger the egg. Any good effect minion on his board will be yummy for Canivorous Cube to target, especially Charged Devilsaur and King Krush.
   
     Spell Hunter: Clear his board completely so he can not make use of such Kill Command. Don't play too many minions so as not to be spammed by the Hounds.
     1 more tip is that when your opponent is under 3 Health, don't play minions so that he cannot use Lifesteal+Rush Zombeast.
   
   Mulligan: Hellfire, Mountain Giant, Vulgar Homunculus, Shroom Brewer
8. Warrior
     Odd Warrior: Their armor is quite annoying and help them sharpening their Shield Slam or Reckless Flurry. Try to play Skulking Geist early to destroy their Omega Assembly and Shield Slam. About Supercollider, that is the reason why I play 2 Ooze! Try to put the small minion in the middle to play around this weapon. Avoid board with 2 minions, especially The Lich King and another big guy.
   
     Recruit Warrior: This deck early game is not good. Try to flood the board and beat his ass with your Drake and Giants.
   
   Mulligan: Mountain Giant, Twilight Drake, Acidic Swamp Ooze
   
   
9. Paladin
     Odd Pally:  These guy are more careful with their flooding board. They try to wait until we play all AOE and then Level Up. We must keep early drop to destroy their hope. Remember to play around Leeroy Jenkins and Blessing of Might. Setup for Defile is another line in the note.
     Exodia Pally: Apply pressure to them so they must play all the AOE. After that, snowballing with Guldan is ez. However, when they are at OTK mode, use Demonic Project to disrupt one of the combo piece.
   
   Mulligan: Defile, Vulgar Homunculus, Gnomeferatu