In this deck you play your taunt minions, which all have deathrattles, and you summon them all with N'Zoth, the Corruptor. I know N'Zoth, the Corruptor is 10 mana and Togwaggle's Scheme is 1 mana, totaling their cost to 11 mana. So when you play N'Zoth, the Corruptor you use Shadowstep on it, returning it to your hand now costing 8 mana, you can then play it next time and shuffle X number of copies with Togwaggle's Scheme.
The Galakrond package helps a lot as clutch draw 1,2 or 4 cards, reducing their cost to 0 can be really helpful and the 5 Armour might just increase your survival rate.
The main counter for this deck is aggro decks (Mech Paladin) but with Sap, Vanish and a little bit of luck drawing the right taunt cards on tempo might hopefully get you a win.
1+2+3+4+5= 15 damage with 1Shadowstep
1+2+3+4+5+6+7 =28 damage with 2 Shadowstep
The rest of the damage you could have done with your minions or spells.
Have fun, annoy the sh*t out of your opponents and maybe even mill them.