Hearthpwn

I've been trying to build out a Plot Twist deck, and by far this is the best version I came up with. It's basically a handlock deck with adaptation to deal with current meta. 

General game plan is to survive longer than your enemy can. You achieve this by shuffling extra copies of Plot Twist (and your hand) back with Augmented Elekk, turning your deck into unlimited deck. In theory, it is better than Archivist Elysiana + return, because Plot Twist shuffles your own deck back, where as Archivist Elysiana can potentially give you irrelevant cards x2. 

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Basically this is your combo to create unlimited deck: 

• HAND: Augmented Elekk x 2 and Plot Twist x2:
  • Play Augmented Elekk then Plot Twist. This will shuffle 2 copies of the remaining Augmented Elekk and Plot Twist in hand, which you can repeat later on.
• HAND: Augmented Elekk x 1, Baleful Bankerx 1 and Plot Twist x2:
  • Play Augmented Elekk, shuffle it with Baleful Banker then Plot Twist. This will give you extra copies of Augmented Elekk, but it gives you the flexibilty to play 1 Augmented Elekk without combo.  

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Against aggro, mulligan for 2 and 3 drops and Hellfire. DON'T KEEP Mountain Giant, explaination below in card explaination section.

In this match up, you want to dump all low cost cards on curve, even your tech cards such as Baleful Banker, Acidic Swamp Ooze or Augmented Elekk since you can copy it back later. It'll force your enemy to trade with their resources, which most of the time equals less face damage. If you're able to make a few favorable trades by turn 5, your chance to win will increase greatly, since you'll be accessible to heals and removals.

 

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Card Explaination:

The Soularium: This is a utility card which will sit in your hand for a long time. It's main purpose of is to combo with Plot Twist, so you can shuffle your hand with extra cards without discarding anything. It can be used by itself in emergency situations, if you need certain tech answers or heal from Aranasi Broodmother to stay alive. 

Acidic Swamp Ooze: Mulligan for this card against classes with weapons. Against Rogue, you might even want to shuffle another copy back with Baleful Banker to maintain tempo later on. Against other class, just dump it on curve. You dont want it staying in your hand or deck when you go unlimited deck route. 

Baleful Banker: While this card is not required in unimited deck, I included 2 copies of this for several reasons.

1. Without this card, you MUST have both Augmented Elekk and both Plot Twist in hand to go unilmited. You cannot play Augmented Elekk without combo. This means that before you draw the combos, there will be 3 unplayable cards stuck in your hand. This can cost you a games in many situations. With this inclusion, chance to combo is a lot greater, and your hand will be untied.
2. In games that don't require ulimited deck, it is also useful to copy relavent tech cards in different matchups.
3. 2/2/2 makes it an ok body to put on turn 2, so you don't have to commit suicide (life tap) aginst aggro decks.

Plot Twist: One of the 2 main combo cards. You must have both in hand for unlimited deck. After you shuffle 2 copies of this back into your deck, it can be used as a 2 mana draw with chance to heal (Aranasi Broodmother), or combo with Fel Lord Betrug for rush armies. This card have saved me countless times on games that are very close to losing. In aggro matchup, use it to replace hand if you have heavy mana cost cards in hand. 

Augmented Elekk: The other half of the main combo. However in games that do not require unlimited deck (mostly aggro or mid range decks), you can play it on curve to divert attention and bait out removals. Think of it as a 3/3/4 body with taunt. You can afford to sacrifice 1 of this since you'll be able to copy it back with Baleful Banker.

Electrowright: I believe this is one of the most underrated card in this expansion. 3/3/3 with high potential to become 3/4/4 without any drawbacks. Playing this card on curve (with or without battlecry) will gain you a lot of tempo against unfavorable matchups such as aggro decks.

Sense Demons: 3 mana targeted 2 cards draw with 8 hp heal in best senario. Hold onto this if you have both Aranasi Broodmother in hand. Shuffle/copy Aranasi Broodmother back will make this card useful again.

Hellfire: Low cost AOE that inflicts self damage. I would hold on to this card again aggro decks early game unless necessary, because most of the time you will have something else to play on curve. Playing a minion on turn 4 (even a 3 drop) is usually a better option than playing this. If you play minion instead of this, your opponent will  assume that you dont have Hellfire in hand and over extend. Since our 3 & 4 drops mostly have more than 3hp, playing Hellfire on turn 5 will usually give a better value by clearing more enemy minions, while leaving your own with 1hp left.

Spellbreaker: Tech card against annoying deathrattles or continual effects. its 4 damage make it a good rush summon by Fel Lord Betrug. Can be swapped out for other tech cards depanding on the meta.

Twilight Drake: Staple in handlock decks for a reason. Good fit to our deck that can bait out a lot of burst damage.

Rotten Applebaum: 4/4/5, taunt and 4 hp heal. Guarenteed heal when summoned by Fel Lord Betrug

Zilliax: Divine Sheild, Taunt, Rush and Lifesteal. Nuff said.

Aranasi Broodmother: Taunt with 4hp heal when drawn that can be shuffled back multiple times. Try to hold onto it for shuffle for as long as possible. VALUE!

Siphon Soul: The only single target removal in this deck. Try to shuffle extra copies into deck in control matchups.

Lord Godfrey: The only card that clears Soul of the Forest. I would mulligan and copy this card against Druid. 

Fel Lord Betrug: Combo with Plot Twist will most of the time give you board full of rush minions with high chance of heal. Late game when you're out of Lord Godfrey, this is the only way to chip out Soul of the Forest or other sticky deathrattles from empty board (you most likely wll have used at least 1 Hellfire by then).

Twisting Nether: Keep both when facing decks that you suspect of having Chef Nomi. You need both since your opponent will always try to return him for another round of 6/6s.

Mountain Giant: I initially didn't want to use this card since it is too slow against aggro decks. To play this at earliest possible, you'll have to tap 2 times, thats 4 damage to face. However after the inclusion of multiple big 3 and 4 drops I decided to keep it, since we no longer need to play this early. This card will be your main damage inflictor in control match ups which can usually be summoned with relatively low mana cost. Great rush minion when summoned by Fel Lord Betrug too.

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Cards I thought about but didn't include:

Doomsayer: This card will buy you a turn or 2 in early stage, but mostly useless afterwards. Its 0 damage makes it a useless summon by Fel Lord Betrug.

Harrison Jones: Warlock doesn't need addition card draw. And at 5 mana, its medicore at best against classes without weapon. It's usually too slow even when put up against Rogue.  

Arch-Villain Rafaam: I think this card is meant for future expansions. The current legendary card pool is too weak right now. Playing this would be a suicide.

Lord Jaraxxus: In current meta, tier 2 & better aggro decks have more than one way to burst out 15 damage in one turn. Play this is just another way to suicide.

Try it out and let me know what you guys think!