In duels I managed to get C’thun the shattered in my hand without it splitting up at the beginning of the game. I think this happened because I had the small pouches treasure, which drew C’thun the shattered at the beginning of the game before it could split up. At 10 mana I could play the card normally and it did its 30 damage battlecry effect as it usually would once the card had been completed.
It has happened to me a couple of times too… And everytime it happened it was while I had the treasure [Small Pouches]… It’s unfair to the opponent and hard to interact with. Especially when you also have [Scepter of Summoning].
Damn that’s a pretty rad combo thou 