Not bad, not bad at all. This confirms that we're getting two cycles of creatures with khan-colored activations, one at mythic and one at rare. Jamming this with a board full of goblin tokens that grow with each hit is solid. This trading with Courser of Kruphix isn't ideal and wasting a turn burning a 2-power blocker out of the way isn't that great. Still, this can go nuts and having a 4/2 Treasure Trove in Gruul colors could be useful. All in all, I think this is a bit of a win-more and its 2 toughness is likely too much of a liability to see play in Standard, at least until Courser rotates.