Hearthpwn

New painfully exciting archetype of Warlock inspired by new support released for this build. Now Gul'Dan can at last fulfill his long-hoped purpose of suffering and self-mutilation where he can drown in excruciating and pleasuring pain by his daddy demons and monsters, while also letting experience it to his opponent for him to have fun too. All 30 cards in the deck inflict damage to Gul'Dan !!

Your ideal plan is to be dead by turn 6-7 with this deck. 

Mulligan

Look for cheapest and quickest self-damage inflictable : Blood Imp, Kobold Librarian, vulgar homonculus, Wrathguard even if you'd rather keep this card for Double-the-Pain combos which i will explain after.

Combos

Cho'gall/Bloodbloom + Felfire Potion for a mighty 11 self damage on submissive Gul'Dan

Bittertide Hydra + Spreading Madness on an empty board for 12 self-damage on average and with a high roll potential of 25 !! dmg to the face !

A single copy of Bane of Doom is teched for a finishing pain to the face in order to turn Gul'Dan into his alter ego Succubus.

!!SSOTK COMBO!! : Cho'gall + Wrathguard + Felfire Potion can make you lose more than half of you life !! Most commonly referenced by the term SSOTK (Semi-Self-One-Turn-Kill, no nazi pun intended)

!!BEST COMBO EVER (TOTK)!! For its enormous power, this combo was deemed too good to be feasible in one turn and Wrathguard has since been nerfed. It can only be made in two turn now:
- 1st turn -> Play both your Wrathguard + Bittertide Hydra. Your opponent won't kill them cause he doesnt want you to experience all the pain alone.
- 2nd turn -> Cho'gall + Felfire Potion + Bloodbloom + Felfire Potion
For a grand STTK (self-two-turn-kill) for 6+5+2*5+2*3+6+5=38 dmg to our own face in a single turn !!! 

EDIT : Nevermind. A SOTK combo is actually really possible : Wrathguard + Wrathguard + Bloodbloom + Felfire Potion + Bloodbloom + Felfire Potion = 32 dmg to the face IN A SINGLE TURN and here we are for the Almighty SOTK combo !

PS : Pulling off a SOTK unlocks a hidden achievement A Gangbang forged in blood and suffer! in Hearthstone whose reward is "All Gul'Dan emotes are replaced by the quote "Suffer !"" (attacking quote)