Hearthpwn

Explanation: This deck was designed for new players, or players that want to play a control Warlock archetype and don't have all of the cards necessary- or in the case of this list any of the cards necessary. I've included a wide list of replacements as you add more and more cards to your collection and I recommend keeping your replacements up to date as they will improve your performance with this deck drastically.

Problems: The main issue that lies in building a budgeted version of a deck that can cost upwards of 9000 dust is you're just missing strictly better cards in most cases. The deck lacks a lot of the avenues to winning that Control Warlock players would be used to, namely Bloodreaver Gul'dan,  Rin, the First Disciple, Possessed Lackey intoVoidlord and boardclears such as Defile, Doomsayer, and Twisting Nether. All of this being said the deck can still perform well in low ranks, and performs similarly to control warlock in matchups.

Win Condition: When playing against aggro your goal is to exhaust their hand with the removal and board clears the deck does have, while keeping your health total out of death-range with Dark Pact, Drain Life, Plated Beetle and Shroom Brewer.

When playing against Control, look to use your tech cards like Acidic Swamp Ooze to remove high value weapons ie. Gorehowl, Aluneth or Skull of man'ari. While searching for your Stonehill Defenders, and hopefully getting Rin, the First Disciple from the discover. Without discovering a high value taunt, such as The Lich King or rin, its very difficult to outvalue control matchups with this list and you'll want to look to close out the game as early as possible.

Substitutes: 

• Defile x2 - Replace Dread Infernal x2 - These cards are very different in terms of effect, one being a whirlwind attached to a 6/6 body and the other being numerous whirlwind effects- Defile still outvalues Dread Infernal and you should look to include it asap because of the mana cost and power level of the card
• Doomsayer x2 - Replace Shroom Brewer x2 - These cards have drastically different effects but you'll find Doomsayer gains you life by preventing damage to your face often, and can provide the same sustain as a Shroom Brewer
• Voodoo Doll x1 - Replace Corruption x1 
• Lesser Amethyst Spellstone x2 - Replace Drain Life x2 or Drain Soul x2 - You'll want to be running whichever of the three you have that is the most powerful or even a combination such as 1 Drain Life 1 Lesser Amethyst Spellstone, the healing from the cards can be necessary in situations but it's mainly included for the single target removal
• Possessed Lackey x2 - ReplaceVoidwalker x2 - This replacement is good to ensure your Possessed Lackey wont pull out any Voidwalkers, if you're low on demons in the deck replace Tar Lurker with Lakkari Felhound as it can be especially powerful with Possessed Lackey
• Rin, the First Disciple x1 - replaces Tar Creeper x1 - They're both midrange taunts with similar stats however; Rin provides a unique win condition vs control matchups and is definitely worth the substitute.
• Siphon Soul x1 - Corruption x1 - Instant removal is worth the extra mana vs larger threats
• Twisting Nether x2 - Shadow Bolt x2 - The deck needs more hard removal or board clears in a lot of situations so replacing early single target like shadow bolt is good, nevertheless I have loved playing with shadow bolt in this deck so you can remove Hench-Clan Thug on curve or spirit singer umbra where they wouldn't expect removal.
• Voidlord x2 - replaces Lakkari Felhound x2 or replaces  Tar Lurker x2 - These are your wall Cards, obviously you'd prefer Voidlord over Lakkari Felhound from Possessed Lackey but without that effect you would rather play Tar Lurker
• Bloodreaver Gul'dan x1 - Replaces Tar Creeper x1 the tar creeper isn't necessary in the deck and although it's very powerful you would rather have bloodreaver gul'dan to attain another win condition.

Matchups:(Explanations and specific strategies/mulligan coming soon)

Unloseable/Very Good - Odd Paladin, Murloc Paladin, Shudderwock Shaman

Good/Slightly Favoured - Spell Hunter, Even Paladin, Big Spell Mage, Elemental Mage, Odd Rogue, Tempo Rogue, Even Shaman, Midrange Shaman, Zoo Warlock, Control Warrior, Rush Warrior

Slightly Unfavoured/Bad - Spiteful Druid, Aggro Hunter, Tempo/Aggro  Mage, Control Priest, Spiteful Priest, Miracle Rogue, Cube Warlock, Odd Taunt Warrior, Taunt Warrior

Very Bad/Unwinnable - Combo Priest, Taunt Druid, Quest Rogue

Thankyou very much for reading through my explanations or taking a look at the list, feedback is very appreciated and expect more updates and changes very soon!