Well that was horribly rude, but understandably.
Fine, balancing. I think flavour wise, this card doesn't make much sense. What is the mount doing, summoning a layer of stone around an object?
Flavour doesn't really matter though, that being said I think a reoccurring Enchant Artifact ruins the balance of the game in the sense that it is already designed with a 6 use cap in mind.
Making it more balanced would be simple, just replace the "does not work on permanents" with "deals 2 damage to Terrasque," and raise it's health up to eight maybe.