So I suppose the partner phrase to that statement would be "If your opponent plays Mystical Teachings, you probably deserve to lose." Sound about right?
That's also correct.
I'm not advocating the card. I'm just saying that IF any deck uses it, it will be because it consistently grabs bombs. Personally, I'm stocking up on Cunning Wish right now to resell on the assumption that it's the best way of grabbing these cards.
I mean, for the price of Mystical Teachings + anything, you could just have an enormous Skeletal Scrying or Intuition->AK.