Hearthpwn

Deck based on Galakrond, the Wretched with some addition of Soul Fragment Pack, and inspired by http://www.hearthpwn.com/decks/1363763-galakrond-demonlock. I also make some adjustments, and put Sea Giant, which well consistent with board that we could create.

The idea of a deck is to make our big guys great again cheaper:

• Jumbo Imp (by sacrificing demons from Galkrond Pack)
• Flesh Giant (simultaneously by hero power and healing from Soul Fragment/Sacrificial Pact)
• Sea Giant (by spamming minions from Galkrond's invoke cards and as answer for opponent's board)

With fully invoked Galakrond, the Wretched in late game these six bring constant pressure on your opponent's liver. 

We have some early removals to deal with tempo/aggro archetypes (Dark Skies, Soul Shear), targeted hard removal (Brittlebone Destroyer), and also late board clears (Plague of Flames, Twisting Nether). So keep on mulligan some of first kind and throw away another (sometimes I also keep Plague of Flames if no early removal in hand, and for control archetypes).

Except removals, mulligan for Spirit Jailer, and choose at least one cheapest Galakrond's invoke card. I also often keep Jumbo Imp, because it's cost reduces only when it in your hand. Twisted Knowledge is great resource card, keep.

Don't hesitate to use your hero power on turn 2 if you put Spirit Jailer on turn one. You have a total of four cards to generate eight Soul Fragment (+16HP), as well as two Sacrificial Pact (+10HP), also hero's health change makes the Flesh Giant cheaper. Chance to draw Soul Fragment grows when deck is depleted so you could bravely use your hero power a few times through game or till 20HP (except for very aggressive decks such as face hunter and weapon rogue).

I never play Galakrond, the Wretched before it fully invoked, and almost always play Kronx Dragonhoof only after it (especially +2/2 when my opponent couldn't deal with my board).