I want to like this card, but I don't think it's good enough. Maybe if it gave 5 stats instead of 4 (i.e. +3/+2 or +2/+3), cost 3 mana instead of 4, or summoned a 3-cost instead of a 2-cost it'd be strong enough. But as is it's just not quite enough value, at least for constructed. In arena, it's probly decent.
I suppose this comes out as fair when compared to Shattered Sun Cleric. We have a 3/2 that gives a minion +1/+1 for 3 mana, I suppose a 2-mana body (like a 3/2) that gives +2/+2 would be about 4 mana. Still, it could've used a little more power since we haven't seen Shattered Sun Cleric since classic or Naxx, so a card of similar value is also probably not going to make an appearance in constructed.