Pretty bad. How can this ever be used practically? If it was a high health taunt minion then it would make sense in conjunction with healing synergies but this is just weird. If it sees play it will be in a new archetype with Blackguard and the likes but first we need higher value healing cards.
When C'thun's Chosen was released, some players said just it's 4/2 divine shield would be enough for it to be competitive, and that almost happened. This is a 4/3 that may get it's divine shield back, even if the chances are low. It surelly looks like a great card, and if we're looking for healing options, truesilver champion will allways be a good one.