What would happen if I Portent of Betrayal'd a creature that had been enchanted by a bestow creature and cast a spell to give it protection from the enchantment's color on it to remove the bestowed creature?
They have just bestowed a Nighthowler on a Asphodel Wanderer and passes the turn. I use Portent of Betrayal to take control of the Asphodel Wanderer, attack and in the second main I cast Gods Willing to give the Asphodel Wanderer protection from black. Nighthowler detaches and where does it go, my control, opponents control or graveyard?
As an additional question, in the same vein:
What if I destroyed the creature while it was on my side? So change the gods willing to a hero's downfall in the example.
Relevent (under state-based actions):
704.5n If an Aura is attached to an illegal object or player, or is not attached to an object or player, that Aura is put into its owner's graveyard.