I think this card has been earning more and more acclaim in recent years, especially as the popularity of EDH has grown, and all of it is well-earned. This card basically makes your opponent less like to try and kill your big things because they don't want you to draw cards. A Terminate targeting a Brontotherium suddenly becomes a green Inspiration (effectively). It's just a really good card and the only real downside is that you have to discard three cards after drawing however many cards you drew. While that can be a problem, as long as you don't sacrifice tiny creatures, you'll always get at least a 1-card advantage.
Pros: Gives you a benefit from creatures targeted by kill spells
Cons: Discard 3 cards each time you use it