There are a few good synergies here to bring up. First, Minh and any version of Grisly Totem.

With Minh, each one of these can be +2 Wild, therefore making it roughly equivalent to 3 Unexpected Courages, which you can pull back from discard at will. That's honestly pretty great, and at its best, is pretty close to a never ending stream of Unexpected Courage.

With Grisly Totem, you'll get the exact same effect. If you have the Seeker Grisly Totem, you could even be drawing a card each time as well.

With Minh AND Grisly Totem, you can stack those effects. That means you'll be able to get +3 Wild icons, 3 times, on a card you can pull back to your hand from discard for 1r.

Of course, to maximize these interactions, you want to commit one and only Glimmer per round, as these abilities have per round limits.

Keep in mind that pulling back 3 Glimmers at once is a burst of 3 cards in your hand. This can empower other effects which note how many cards are in your hand, such as Curiosity, Higher Education, and so on.

Outside of Minh and Grisly Totem, the other great use of Glimmer is as discard fodder for something like Wendy, Pete, or Cornered. You can happily chuck these cards into your discard pile whenever and draw them all back when you need to. Of course, other cards are discard fodder (Winging It, et al.), however those cards can't bounce back into your hand nor do they have icons in case you need commitments. Due to its easy recursion and flexibility of use, Glimmer is the most reliable discard fodder currently in the game.

Quick question on this. It's apparently been confirmed by Matt that there's a limit of one Essence of the Dream in your bonded cards. There doesn't seem to be a limit on the number of Dream Diaries you can have in play though. Does this mean that you can theoretically hold two of them at the same time and double trigger the boost ? I'd assume that you can't have two versions of this one in play and commit for an effective +6 every time you're at a 4 shroud location, but you could for example have the Explorer and the Child version in play simultaneously and then contrive to be at a high shroud location while you have 8 cards in hand to achieve the same effect ? I don't see any obvious reason why not. It's probably not worthwhile, but with the right build this could theoretically turn into a test-passing monster. Minh could theoretically commit a +7 boost to any test anywhere on the map every turn.

I doubt one thing... Can you investigate un your location and get a clue from a conected but non-discovered location? I mean, from a location that you never get in before.

I don't fully understand how It works. Thank you for the answers...

These cards are absolutely 100% crazy nutso bonkers good. I thought they would be ‘ok’ after all they’re quite expensive and limited to a once-per-turn boon but I was deeply wrong in that analysis. Play Sefina and investigate once per turn as if you were a 4 intellect Seeker. Punch an enemy or a locked door at 4 despite being a weak butt. Evade that 20 health monstrosity despite being some slow loser like Jim.

They’re slow and expensive, an issue which is only slightly salved by Uncage the Soul and finding the ones you want can be difficult unless you invest in Lucid Dreaming so I could see this being an issue on ‘sprint’ scenarios like Essex but they’re still far too good to pass up. In my opinion they slot best into Sefina right now as they complement her dawdling, defensive stat line nicely, she can make better use of the Alacrity boon than most, and she can more readily pay for them.

I don't see much use of any of the Empower Self cards.
Most Mystics will prefer to use their willpower since it's likely to be their highest stat, plus it takes up a highly coveted Arcane slot.
I can see it appearing in a Werewolf Diana Stanley deck, particularly in the Eldritch Knight variant.
Outside of Mystics I doubt Patrice Hathaway can truly capitalize with her low ,, and , particularly on higher difficulties.
Sefina Rousseau is plagued by the same limitations, while also having it compete with Double, Double (4), Borrowed Time (3), and Suggestion (4) for the Arcane slot.
Intriguingly, I can see a support Daisy Walker taking this, with limited competition for her Arcane slots and ability to maximize its utility combining with Encyclopedia (2), Strange Solution (4)
Norman Withers might be able to make use of Empower Self: Acuity, but the not much of the others. Besides, I'd prefer to use Scrying (3) as well as Shrivelling (5)/Mists of R'lyeh (4) on the Arcane slot over Empower Selves.

Did I miss out on any investigator who is able to pick up Empower Selves?
Or any combinations that maximizes its utility?