Edit: Updating because of the "At no cost" ruling only removes resource costs. Some of the other cards are still good, but more situational.

This card is pretty insane, as you get to staple the effect of any level 0 asset or event to a successful skill test at no cost, along with an unexpected courage to help you with that test. As of printing, here's the valid users - Sefina Rousseau, Zoey Samaras, Father Mateo, Sister Mary, Luke Robinson, Lucius Galloway, Agnes Baker, Akachi Onyele, Marie Lambeau, Dexter Drake

Here's a list of some of the generically powerful things you can do with it, even without specific scenario/card combo interactions. This is just my list that I threw together, I'm sure there are other respectable cards and some that are particularly strong given specific scenarios/situations. To me the thing that makes this card sing is its sheer versatility - almost any of the below effects are very strong, and you get to choose the best one for any given situation.

Take an extra action every turn for the rest of the scenario: Leo De Luca

Discover 2 clues: Extensive Research

Deal 3 damage to each enemy (and investigator) at your location or a connecting location: Dynamite Blast

Evade all enemies at your location (including elites): Cunning Distraction

Move up to 3 times without engaging enemies: Scout Ahead

Gain 3 resources: Emergency Cache

Gain 5 resources for items only: Schoffner's Catalogue

Gain 5 resources for events only: Same Old Thing

Draw 3 cards if there's a clue at your location: Preposterous Sketches

Draw 2 cards (and discard 1 for each filled arcane slot: Eldritch Initiation

Search the top 6 cards of your (or an ally's) deck for a card and draw it: No Stone Unturned

Get a generically powerful yellow card: Dr. Milan Christopher

Get a generically powerful green card: Lucky Cigarette Case

Less good cards after the ruling:

Gain 8 Resources for investigators at your location: Bank Job (Hot Streak is 4xp and nets you 7 resources) [costs 1 additional action]

Draw 5 Cards for investigators at your location: Thorough Inquiry (All In is also 5xp, but Memories doesn't have the weakness clause) [costs 1 additional action]

Move, discover a clue, and activate an asset (can also be given to other investigators at your location): Task Force [Costs an additional action]

Automatically evade or deal 1 damage to all non-elite enemies at your location and connecting locations: Elaborate Distraction [Costs an additional action]

And some situationally useful ones:

Gain 3 slotless horror soak for your team: Something Worth Fighting For

Gain 3 slotless health soak for your team: True Grit

Gain 2 slotless health+sanity soak Resilience

Move and heal: Physical Fitness

Heal 3 from investigators and allies at your location: Infuse Life

Resign: "I'm outta here!"

Gain 3 supplies or ammo for assets you control: Cleaning Kit, or with soak if you have an ally slot: Venturer

Double the ammo or supplies on an asset you control: Contraband

Turn your events into skills(with updated ruling you still take the weakness): Crystallizer of Dreams

Grab a clue and find an enemy to kill: Kicking the Hornet's Nest

Discard a Terror treachery from an allied threat area (as long as you have at least 1 clue): Logical Reasoning

Grab any one of the masks: Cat, Fox, Mouse, Sparrow, Wolf

Trade resources, items and allies: Teamwork

(Please "like" review so I don't get locked out of posting more)

Utterly baffling card. The first two copies are worse than Unexpected Courage. Once you've used or discarded those, you get one copy that is a +3 to either of two skills. But there are plenty of 0-1 XP skills that give +3 or more with conditions. In Seeker you could just grab a Survey the Area. Your 1 XP gets you all three copies of Quick-Witter, but since only the third is actually good, you might as well just buy one copy of a better skill.

The only additional benefit here is the option to shuffle the other two quick-witteds back into your deck afterward. If you keep cycling them, then alternate copies are worth +2 and +3, repeatedly. But once I have a few XP under my belt, I feel that shuffling those Quick-Witted back in my deck probably isn't improving it at all.

No matter how small your collection, you can at least run 2 Perceptions, 2 Manual Dexterities, and 2 Unexpected Courages, all of which will do more for you than these cards will.

I would imagine the card is great for all the reasons on Wolf’s review. Yet, from a design perspective I am not sure I love the fact that rogues are turning into some kind of agility mystics. It plays well and makes some investigators stronger, but this kind of design dilutes the classes’ identities.

What I find interesting/weird/funny is that, if you play on hexpert and reveal the skull during act 1 and fail, you can choose one of the victory enemies and simply discard it. Which is bad if you are after xp, but you still essentially ignore the penalty of the token. shrug

The card is a very effective way to get clues from locations with high shroud even without removing the doom. However, the taboo on Signum Crucis makes it a great combination with this card on earlier scenarios. With this and Fortune or Fate you can net your team 2 extra turns per scenario.