Abuse the effect of Aviana to play up to 6 copies of Ragnaros the Firelord and clear the opponents board to deal up to 48 face damage.

Basic idea is to use Wildheart Guff to ramp up to 15 mana then play Aviana into Ragnaros the Firelord, pop the Ragnaros into a Carnivorous Cube, copy the cube with a pair of Faceless Manipulator before nuking the board with our old friend Deathwing the Destroyer

Combo costs 15 mana so we need to either drop Guff and reach 15 mana or use Kun the Forgotten King between 11 and 14 mana to pull off the OTK

Rest of the deck is survival tools (armor gain, spot removal), ramp or draw