That's irrevelent as Crem decks can generate that quanta and the 20 damage worth of creatures first turn anyways. The major drawback of Shard Golem decks is that while you can get a lot of damage out instantly, you don't follow up as well on subsequent turns which in turn loses you a lot of speed.
Playing around with it I don't think it's that OP. I think probably the best application is getting those first turn golems out, and even then it's not that powerful. Not unusable but not the fastest. A somewhat viable alternative to other rush decks. Maybe someone will come up with something wacky but for now I would put this around SoV in terms of power.