Initiate investigation test -> (if you fail) play Live and Learn
Commit the attached Live and Learn to the same test so it lands on top of discard pile
If you fail repeat from step 1.
As an additional cost to put this card into play, you must search your bonded cards for 1 copy of Guardian of the Crystallizer and shuffle it into your deck.
After you play an event: Attach it facedown to Crystallizer of Dreams instead of discarding it (to a maximum of 5 attached events). Attached events may be committed to skill tests as if they were in your hand.
Hmm, a rouge card that synergies with event cards; now who could stand to benefit the most from that?
In all seriousness, this is a bit like Backpack in that you either build a deck around it, or you notice you have a large number of events in your deck already and might as well add it.
As for which investigator to give it you, signature events cards are a good place to look. Sefina get a whopping THREE extra Guts or Manual Dexterities, thanks to The Painted World, before she's even starts choosing cards, so for her, it's an auto-include. "Skids" O'Toole might want a look, what with On the Lam having the most skill icons in the entire game (counts as 4), as well as a selection of guardian event providing and icons. If you still hold out hope of Lola Hayes, two Unexpected Courages from Improvisation will be really nice, and EVERY event is at your disposal.