This deck wants to use Tainted Remedy and burn their opponent into oblivion using life gain spells.
Tainted Remedy -- centerpiece of the deck
Swords to Plowshares/Devour Flesh -- awesome removal that becomes all upside with the Remedy in play
Dark Ritual -- helps to power out Tainted Remedy as soon as possible and just provide mana for other situations
Enlightened Tutor -- again helps to bring out the Remedy as soon as possible
Wall of Shards -- nice, cheap defender that allows for a stall and the Remedy again turns the cumbersome downside into an ever-accelerating clock.
Life Burst -- solid, instant speed "burn" that gets ever the better the more I've played. A two mana 8+ damage burn would just feel sooooo good.
Rest for the Weary -- Another powerful life gain card that can hit hard with minimal set up.
Soothing Balm -- Becomes a two mana instant speed Lava Axe. What's not to love?
Thoughtseize -- Early game control.
Damnation/Wrath of God -- Wipes the board clean
Drown in Sorrow -- Helps to snipe some aggro decks, whilst providing minor card advantage.