11-3 in ranked (platinum rank 5-2) Overall 83% winrate.
I did make one modification, swaped the Evil cabal rats x2 for 2 Pharoah cats, helps vs aggro match up vs face hunter and mech/murloc paladin with lifesteal and taunt reborns. Plus helps with curve having a one cost playable minion as well as a turn 4 activator for Evil miscreant and SI agent vs a 2 cost waiting till turn 5. Cheers, Good Job.
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If you like playing C'Thun I would recommend you check out my deck as well:
https://www.hearthpwn.com/decks/1345991-rogue-fanatics
It's not very good but I've managed a decent win rate with it. Anyways I love your deck! C'Thun was one of my favorite eras of this game for me.