If you're on the draw, you are already one land behind on their turn, when you would use it. I think that you need that mana to keep up. I only opt it in when I'm on the play. Sure you could main deck it, but I rely on oblivion ring the first game until I know what I'm up against, and if I'm on the draw or not. Also worth mentioning that Negate could be better against decks such as Wolf Run Ramp, still not sure which is better
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