I played a match a while ago and in that match I played a Golden Monkey after previously having played a Mistcaller. My hand got replaced, and as expected, those cards all lost the Mistcaller buff.
But, to my surprise, the legendaries I drew from my deck retained the Mistcaller +1/+1 buff.
Is Mist Caller placing a buffed state that triggers when ever I draw a card, rather than buffing cards of my deck in place?