400 dust

I have high doubts that the Enrage effect would go off regularly on this, since it’ll either be removed in one turn (e.g. Hex, Fireblast + Frostbolt) or be ignored (making it harder to Enrage through the Divine Shield). These two effects counteract each other in an interesting way that makes it weaker in the long run (but still really darned interesting to think about. I know I wouldn’t have thought about the interactions between those if I didn’t see this).
 
That being said, this is basically a 7/3 with Divine Shield since the enrage effect is usually moot, and an 8 mana 7/3 is a bit on the weak side even with Divine Shield. It’s basically a C’Thun’s Chosen combined with a Scarlet Crusader, except it costs an extra mana to combine them. Because of that and the low odds of this Enrage effect actually going off, you could realistically bump up the health to 5 or 6 and it’d still be relatively fair.