Hearthpwn

This deck is absolutely crazy and pretty cheap. You leverage the new Scarab Egg and Spirit of the Bat cards with some old tools to just burn your opponents down with wide boards. 

Ideally, you mulligan for Kobold Librarian, Scarab Egg, and Sanguine Reveler. If you have the coin, the best play on turn 1 is Coin + Scarab Egg followed up with a Sanguine Reveler to create a 3/3 and three 1/1s.

In the midgame, when you have a decent sized board, Devilsaur Egg + Grim Rally is insane tempo (create a 5/5 and give all your minions +1/+1 to hit face, for 4 mana).

You really don't want to reach the endgame, because you will NOT beat a lot of decks once they can stabilize the board. Glinda Crowskin is really powerful in this situation and there is one game against an odd paladin that I won off a Glinda + 3X Spirit of the Bat and then trading three minions into his board, buffing my one minion in hand, Doubling Imp, into an absolute monstrosity.

Use the Spirit of the Bat as a deterrent for clearing the board and to create a situation where your opponent is trading against 1/1 on board and these stats simply accrue back to the minions in your hand. 

If you aren't having a hard time with larger minions, you can replace Lesser Amethyst Spellstone with Saronite Chain Gang. I initially had them in that spot but kept running into decks that played defensive minions I didn't want to trade into.