When you combine the Shard with x3 Shard of Readiness you get the skill Deja-Vu, As mentioned in previous posts, having upgraded cards should feature upgraded skills, when using Deja-Vu, I've noticed the clone isn't airborne whereas the original version does.
If using a upgraded Shard (of readiness say) the stats of the Golem are affected... I also believe if using a Upgraded Shard of Integrity, the skills that Golem possesses should be that of upgraded quality too, so Deja Vu would summon an exact copy, mutation would be improved mutation etc etc.
It's a underused deck but it really could make it