Honzi/Guides/Hearthstone/Renounce Darkness Warlock
Playing:

• Hard mulligan for Renounce Darkness.
• The coin should not be used for additional card draw, since it becomes a lot better after Renounce Darkness is used. You can use the coin to reduce your hand size from 10 to 9 at the end of your turn, since the mana cost of the Warlock card you draw will be reduced by 1 anyway.
• After you have played Renounce Darkness, avoid picking another one when discovering cards. It only replaces Warlock cards, which you no longer have.

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Some cards are helpful enough that they should be included in every Renounce Warlock deck:

Aranasi Broodmother	6	Common	Warlock	RoS
Dreadsteed	4	Epic	Warlock	TGT
Impbalming	4	Rare	Warlock	SoU
Kabal Trafficker	6	Epic	Warlock	MSoG
Lesser Amethyst Spellstone	4	Rare	Warlock	K&C
Prince Malchezaar	5	Legendary	Neutral	ONiK
Renounce Darkness	2	Epic	Warlock	WotOG
Twisted Knowledge	2	Common	Warlock	GA

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You should prioritize adding Warlock cards that add other Warlock cards to your hand or deck without damaging your hero. Make sure you always select the best Warlock card when discovering:

Call of the Void	1	Common	Warlock	Classic
Dark Peddler	2	Common	Warlock	LoE
Dark Possession	1	Rare	Warlock	WW
Demonic Project	2	Common	Warlock	TBP
Rin, the First Disciple	6	Legendary	Warlock	K&C

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Next prioritize adding Warlock cards that help you get closer to drawing Renounce Darkness by drawing cards:

Kobold Librarian	1	Common	Warlock	K&C
Mortal Coil	1		Warlock	Basic
Plot Twist	2	Rare	Warlock	RoS
Sense Demons	3	Common	Warlock	Classic
The Soularium	1	Legendary	Warlock	TBP

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Next prioritize adding Warlock cards that help you clear or control the board:

Abyssal Enforcer	7	Common	Warlock	MSoG
Bloodreaver Gul'dan	10	Legendary	Warlock	KotFT
Corrupting Mist	2	Rare	Warlock	KotFT
Defile	2	Rare	Warlock	KotFT
Demonwrath	3	Rare	Warlock	BRM
Despicable Dreadlord	5	Rare	Warlock	KotFT
DOOM!	10	Epic	Warlock	WotOG
Dread Infernal	6		Warlock	Basic
Felfire Potion	6	Rare	Warlock	MSoG
Hellfire	4		Warlock	Basic
Hooked Reaver	4	Rare	Warlock	K&C
Shadowflame	4	Rare	Warlock	Classic
Siphon Soul	6	Rare	Warlock	Classic
Twisting Nether	8	Epic	Warlock	Classic
Voidlord	9	Epic	Warlock	K&C