This card is better than it seems. Yes, you read that right.

It is an intriguing build-around for Rex Murphy decks. First, remember that you have to Resolve the tokens, not just Reveal them (so no Rod of Carnamagos shenanigans). Rex’s infamous Rex's Curse makes you not only Reveal but also Resolve tokens TWICE per test. But wait, there’s more! After you Resolve the tokens during the initial Rex's Curse check, you return them to the bag. This means that you can draw them again on the second part of the test, giving you a better chance of drawing the tokens and adding even more Secrets to the Cryptic Grimoire.

Once you have set up your assets and got the game rolling, you can expect to perform 2-3 Skill tests per round, including Investigate and Treachery checks. With Rex's Curse, you get to Resolve tokens 4-6 times per round (assuming you keep succeeding in the tests so you don’t shuffle Rex's Curse back into the deck). That’s plenty of chances to add Secrets to the Grimoire when using a deck. And what can you do with the Grimoire’s discounted Fast Insight cards? EVEN MORE Skill tests, each giving TWO chances to Resolve tokens (though most relevant Insight cards are testless). This card turns Rex's Curse into a signature boon.

There is, of course, a risk of failing Skill tests due to the tokens, but even then, you are not left high and dry because at least you get the Secrets to play your Fast Insight cards to make up for the failed test.

In addition to some Insight cards, Rex Murphy can generate tokens with Gabriel Carillo, and by throwing away his stuffy nerd glasses and replacing them with new sparkling Prismatic Spectacles.

Some notable Insight cards for Rex are Rex’s own signature card Search for the Truth, Burning the Midnight Oil, Deep Knowledge, Delve Too Deep, Drawn to the Flame, Existential Riddle, Preposterous Sketches, Stirring Up Trouble, and Ravenous Myconid's Uncanny Growth.

If Norman become Body of a Yithian during City of Archives and lose the ability of revealing topdeck (or Stubborn Detective whatever), can he trigger the 2nd ability of Livre d'Eibon ?

Since he no longer knows what card the topdeck is , I suppose he may not trigger it.

Hey Dr. Elli Horowitz, could you hold this for me? My hands are kinda full. Let me just put it on top of my deck first

Aside from the funny Norman Withers combo made easy with Research Librarian; Jim Culver, Gloria Goldberg, Luke Robinson, Marie Lambeau, Zoey Samaras, and Roland Banks are the only investigators who can use both this and Elli without picking up a rather dubious permanent. Some of these investigators are far more likely to be interested in this weapon and ally than others.

Even if they're not struggling for hand slots, considering people run things like Prepared for the Worst, Cyclopean Hammer having access to a similar tutor that cheats the thing directly into play is a pretty serious advantage over other alternatives. It's almost certain there are other relics you might have in your deck you would not mind finding instead.

If you're worried about encounter cards blowing up your hammer, I think you're just a coward. Just don't get hit.

An interesting interaction I just happened upon and didn't see mentioned elsewhere: if I'm not mistaken, you should still be able to attach Weakness events to the Crystallizer after playing them! This could be cool tech for builds that go through their deck at least twice per scenario to prevent having to play the Weakness a second time.

Matching weaknesses here: arkhamdb.com arkhamdb.com

Q: Does the Mouse Mask recharge after Luke Robinson triggers the Gate Box which puts into play Dream-Gate: Wondrous Journey? How about when the signature weakness Detached from Reality puts the other Dream-Gate: Pointless Reality into play?
A: Yes to both; in both cases, Dream-Gate is “put into play,” replenishing an offering on Mouse Mask.
Note: Not sure how to add this to the FAQs section above, but this is the official answer I got from FFG.