There was a similar Dragon's Maze card that got similar buzz and did absolutely nothing in Constructed. This is strictly better than that card in many ways, but I'd be cautious about revving the hype train into overdrive.
Edit: It was this card, and this isn't strictly better - I had forgotten that Blood Scrivener proc'd on each draw, not each turn.
http://gatherer.wizards.com/Pages/Card/Details.aspx?multiverseid=369030
Depends on the deck, it's strictly better in something like Modern 8Rack where this can draw you into Instant speed discard before their draw step. Being able to Madness cast it off +1'ing LotV isn't a small benefit either but it's hard to say how well it slots into decks like BGx without playtesting it.