As Gnarl's Apprentice and Zinjanthropus have noted in the comments, this card will work with Scrying Mirror and Premonition. And if it combos with those, then you can also use Dark Prophecy and Olive McBride as well, making the card draw an all but guarantee when you want it. You can also use Recall the Future to ensure a success. This makes it an incredibly powerful tool and worth considering in anyone who is going to pack even a few chaos bag manipulation effects.
Scroll of Prophecies has rapidly become a mainstay of mine, and I suspect it will continue to be so since it occupies the much less congested Hand slot. However, the Pendulum is cheaper, does not require an action to activate, and doesn't force you to discard. All of which are incredibly valuable traits that cannot be overstated. The reason the scroll works so well is that you're generally comfortable discarding something; I am anyways. And if that's the case, it means there are key cards in your deck you want to have down; the rest are just candy.
The Pendulum will help you draw up those axis cards you want to see as well as grant you that sugar rush I mentioned, and the boost ensures you aren't sacrificing your accessory slot. Really, the only downsides to this card is it will be inconsistent when you don't have tech to help see the tokens, and not all the tech is full proof. You could replace this with a different accessory once you've dug up those essentials, but again, that +1 means you don't have to.
This is an exciting card that plays well with the guesswork approach. 's have been a bit starved for card draw but that is changing. Crystal Pendulum is a welcome addition that makes your jewelry of choice all that much more competitive and rewarding.
EDIT: One thing I did not mention originally is that even taking a gamble is not hugely risky, and not simply because there's nothing lost if you guess wrong, but because you're guessing the modifier, NOT the token. Unlike Recall the Future, the Skulls could be say -1, which is a popular token already. You're statistically more likely to get the card draw in this way, and seems to be an improvement over Recall the Future.