I feel this card is most useful for Sefina Rousseau. Sefina has a Willpower of 4 and is naturally event-focused. She's likely to see this early as well thanks to 3 copies from Myriad and a 13 card opening hand. Lockpicks was already fairly strong for her, allowing her to investigate at a base of 6. Lockpicks + Mind's Eye allows her to investigate at a base of 8 (or 9 with Holy Rosary), making it much more likely you can hold onto those Lockpicks supplies at high-shroud location.

While it does compete with Double, Double and Suggestion for your Arcane slots, it's significantly cheaper in exp than the former, and gaining 3 copies on purchase makes it a more consistent find than the latter. Consider taking Mind's Eye as an early purchase while saving towards the 8 XP for Double, Double, then afterwards grabbing a Versatile to throw in your favorite off-class event, a Sign Magick or two, and more of those fantastic rogue events (alternately, some Guts or Lockpicks if you want to mitigate some of the consistency penalty that comes with Versatile's extra cards)

Benefits gained from skill cards are always nice because you never have to commit actions or resources to gain the desired outcome. Cards like Fearless for healing horror, or Quick Thinking for gaining actions. But in theory Nimble potentially provides a whopping 3 free actions! That's insane value, and you're not even paying anything (except the card itself).

So what are the downsides? Firstly it's only valuable if you need the moves. Maybe you still need to gather clues on your current location, or you need to stick around to act as bodyguard. If you don't need to move, then Manual Dexterity is better in every way. Secondly, can you move? The scenario itself could be preventing you from progressing further.

Maybe you'll put it to good use when you evade spoiler and subsequently use the move actions to reach the exit in spoiler. But if you have access to Nimble then you almost certainly have access to Elusive (a fast disengage and teleport), so even the above hypothetical is questionable at best. A very circumstantial card. I predict this card will be most frequently used for a single move action, in which case Quick Thinking is arguably better.

TL;DR - Hard to get maximum value from it, most likely used for 1 free move.

This card is surprisingly good with Agnes. All she really needs for items is a meat cleaver, the rest can be spells. And you’re going to want those +3 fight or that agility if you don’t get your spells out immediately, or if you simply want to evade something and don’t have the opportunity. So it turns out physical fitness is vital to being a waitress, which makes sense. Those plates can be very heavy.

This is simply not a good card. You basically have to build around it to get a good benefit from it(unless you happen to only be running one item anyway, which is rare.), and the benefit isn't strong enough to merit doing that.

Expensive, but absolutely worth it. Jim Culver in particular loves this cat, as it provides protection against a good chunk of the chaos bag when combined with his ability (plus his elder sign isn't so hot anyway). At 3/3 health/sanity and only two resources it also works well as a sturdy shield that has the potential to heal itself.