I'm surprised that Khadgar mage doesnt do better than it appears to. It has the potential for insane power if it is able to go off.
But perhaps it's partly because it relies so heavily on one card to make all the difference. I don't know. I'd give it a try myself, but I don't have the dust to craft him yet. Maybe one day... lol
The biggest problem with Khadgar Mage at the moment is that Mage has trouble living long enough to be able to play Khadgar and Power Of Creation on the same turn. Or Khadgar and Astromancer.
I was super Hyped to try Summoning Mage and crafted Khadgar Day One. I'm persevering with it, but against any kind of Aggro Deck I get demolished.
I feel like the potential is there for it to be amazing. It just needs... something... to keep the tempo up and get there. Perhaps it's a similar thing to Bomb Warrior, where it needs "less" of the greedy cards to be more effective. I don't know. I'm so tempted to craft Khadgar to experiment...