Hearthpwn

Make your opponent go crazy with Combos over Combos: Steal everything you want with Potion of Madness, Shadow Madness and Cabal Shadow Priest.
Attack to high? No Prob! Shrinkmeister and Pint-Size Potion will do the job!
And out come the "wolfes"! Make everything yours with Recombobulator and  Cabal Shadow Priest.
Special appearance by: Furbolg Mossbinder

Generel:
Its a minion-based Tempo Deck, and nothing is more tempo than stealing your opponents minions!
Needless to say that its first of all a Meme-Deck but it should be decent in a heavy Minion-based Aggro/Tempo Meta.
Establish early board-presence with Northshire Cleric, Shadow Ascendant Radiant Elemental, Acolyte of Pain and let, apart that, the stealin synergies flow.

We dont have a real finisher, so try to act fast vs Aggro and Tempo, and dont wait always for the perfect steal. Take what you can get.
In Control Match-Ups you will have to steal something Big to stand a chance. So save your combos like Shrinkmeister, Pint-Size Potion, Shadow Madness, Cabal Shadow Priest or Recombobulator for some heavy Hitters!

Mulligan:
Hard for Northshire Cleric, Radiant Elemental, Acolyte of Pain. You might also keep the Corridor Creeper if the opponent plays Paladin or Hunter. Vs Aggro always keep Potion of Madness.

Dont forget that you always have to kill or transform the stolen minions or they get back! So act cautiously with your Recombobulator and Furbolg Mossbinder.

Some additional C-C-CCCCombo: Recombobulator your Corridor Creeper after he he s done his job for a 7 Mana-Wild Minion and transform your Recombobulator with the Furbolg Mossbinder for a additional 6/6.

Edit: Refined the deck with some changes:
-1 Shadow Visions
-1 Lightbomb
-1 Shrinkmeister
-1 Dirty Rat
+2 Corridor Creeper
+1 Shadow Word: Horror
+1 Pint-Size Potion