This card looks cool, but needs a lot of help to be as cool as it looks. Getting 7 cards for 4 mana is awesome, but the fact that you can only cast one spell per turn alongside the fact that, if this card gets destroyed, you will lose everything associated with it makes it a little too vulnerable. You also need a way to remove this card once you're done with it, something which mono-black may have difficulty with. In a black/green or black/white deck, this card fares a little better, but not much.
Pros: 7 extra cards for 4 mana
Cons: Cards are vulnerable, one spell per turn, can't draw