This deck is based on setting up an OTK with the help of 4 particular cards.
Leeroy Jenkins is your main plan, if you draw him with Farsight you don't even need Thaurissan.
Windfury is the second lynchpin of the deck (unless you draw double Ancestral Spirit and double reincarnate). 2 mana double your damage is amazing.
The following 3 cards can replace eachother quite well, depeding on what you draw:
Rockbiter Weapon: 2 mana + 6 damage with windfury, not viable without it.
Ancestral Spirit: Requires Reincarnate to work.
Reincarnate: Almost as good as windfury if you don't need the rockbiters.
Lethal List: (All of these OTKs cost 13 mana and 5 cards, one of which is Leeroy):
Leeroy + Windfury + Rockbiter X2 + Reincarnate
Leeroy + Windfury + Rockbiter + Reincarnate X2
Leeroy + Windfury 2X + Rockbiter + Reincarnate
Leeroy + Windfury + Rockbiter + Ancestral Spirit + Reincarnate
Leeroy + Windfury 2X + Reincarnate X2
Leeroy + Ancestral Spirit X2 + Reincarnate X2
For extra help:
Far Sight: If you draw Leeroy with one or 2 other pieces of the combo you don't even need Thaurissan.
Emperor Thaurissan: Has to hit atleast 3 pieces of the combo. (Or 2 pieces twice or Leeroy 3 times).
Other cards are divided between stalling and backup combo pieces. If your dunemaul shaman sticks for 1 turn, feel free to double Rockbiter turn 5 for 20 damage, or if your opponent only has 16 health, Reckless Rocketeer + Windury + Rockbiter for 16 damage from hand. These cards aren't critical, feel free to change them for more taunts, heals, AoE o draw.
Disclaimer: This deck, if you can't tell, is NOT meant to be competitive. Last time I had something similar was before Leeroy went from 4 to 5 mana and I now longer own him to track win-rates, but I assume it is abismal. But if you are looking for a really satysfying win out of nowhere, your search is over!