it is not op, if with hg u can keep drawing cards no matter what (except for full hand) this will fail at least 50% of times (implying u have a deck with at least 11 pillars and 4 of this for draw chance, 15 creatures); more copies of hg=more u draw, more copies of this = wasted draw
dark sight can inderectly mill some cards from the deck and potentially deck out
the broken rules are pretty much being able to manipulate cards that are still in the deck, being able to mill, different element for the upgrade