Exactly what I was thinking. Wild Pyro with circle of healing for ridiculous C'Thun. Interesting to see priest/c'thun decks as an actual deck and not just control priest with c'thun finisher (although that could probably still work).
So Hunter's mark got changed from 0 mana as Hunter got a few pings but Circle of Healing doesn't when it has been used like a flamestrike for four, Draws an insane number of cards and now C'thun buffs which may not be insignificant? In all seriousness the card is great, good statline with an effect that can spiral every now and again. Wish it was when you heal as your opponent is punished slightly for healing also, and with C'thun coming they may want to heal a little.