This is just your regular Miracle Druid, except this time you're utilizing the mana reduction abilities of Aviana and Ysiel to cast Auctioneer and the pieces of C'thun to then draw C'Thun, the Shattered, play it, and play it again with Flobbidinous Floop if necessary (or use Floop as an extra Auctioneer to draw more quickly and find C'thun if you don't need as much damage).