The main win condition of this deck is C'Thun, the Shattered. I say main because this largely depends on the what you're up against. The decks second win condition is by Milling/Fatiguing your opponent through your Tickatus combo.
Mullians: Always Keep Supreme Archaeology and Plot Twist and maximize the drawing into your C'Thun activators. Once drawn, you're going to want draw and play them ASAP. Against slower decks will allow you the added benefit of using your Tickatus..
Mulligans: Try to keep early game removal such as Dark Skies, Unstable Felbolt, Soul Shear, and School Spirits; I would prioritize the latter two if going agaisnt DH/Hunter, as you want as many healing opportunities as possible against these decks. Prioritize Felosophy + Aranasi Broodmother + Plot Twist along with your Sense Demons to generate as much healing as possible over time. The deck has the ability to generate up to 56 health over time passively. Super aggressive decks will not be able to keep up with your health and removal as long as you control the board in the early game.
Card Swaps/Specific Matchups
Feel free to play around with this list. If I'm against Warrior I like to swap in Ironbeak Owl [/card] and/or [card]Acidic Swamp Ooze for one or both of the Felbolts. Against Clown Druid, keep your Twisting Nethers.
Let me know if you notice a better way to play it or if you think it's useless to keep C'Thun. Happy to hear feedback!