Looks good! Would love to see it in action, though I fear it lacks tempo compared to the current meta.

Why not add secret passage for an increased chance of assembling c’thun ?

It is striking that for the ‘Corrupt’ cards to really be useful, the meta needs to slow down. Because of the requirement to play higher cost cards (generally higher than 2) & you need to keep them in your hand for longer. Unless of course the cards/decks that run them are really powerful (https://www.hearthstonetopdecks.com/cards/yshaarj-the-defiler/ ?), or we get more ways to slow down aggro (https://www.hearthstonetopdecks.com/cards/renowned-performer/ seems like an example).