Hearthpwn

This idea came to me after I saw how many cheap spells that Druid has, and how all of the cheap spells that druid uses are often used for playing big minions early and giving the player extra mana crystals to use. This seems to synergize well with a late game Yogg-Saron, Hope's End.

So basically the strategy is to control the board as much as possible, playing your C'Thun minions in order to buff him. You should feel safe to play C'Thun as a finisher when your opponent has little board presence, or as a board clear if desperate.

Finally, if you go farther into the late game (which you should) and you find yourself with a lot of choose one spells, you can get more value out of them with Fandral Staghelm. Also, don't be afraid to play him earlier if it means a board clear or general tempo swing. With five health, he is less vulnerable to clears on an empty board. Like Braan, he seems to be a priority to clear, so use that to advantage.

This deck hasn't gone through very extensive testing, so if anyone tries it out, feel free to report their success in the comments!