I mean how do you want to balance it. You could easily make this card 5-0 and it be reasonable if you have to give up your next draw step. Realistically you also have to give up playing that card, since it requires you to use 5 mana the same turn that you draw it. It's probably at it's best as a card at 3-3 honestly, letting you get it off a workshop and then figure out how to activate it if that is your thing.
I've just always thought it's a cool concept card that I'd like to see people get creative with. I'd like it see some action, maybe fetch a cool card from someone's collection, and add some play value. Just trying to find the sweet spot where it's not broken, but also highly desirable to play.
I think the loss of a draw puts it on par with vampiric/mystical, but with a lot more options.
I'm was originally thinking maybe 4&2, but now I think I could be aggressive with it at 2&2, or be reasonable at 3&3.