I've used this card (mostly with Agnes) but I'm not sure about it.

At its best, this card is 2 resources + 4 actions (counting the one to play the card) to heal 3 horrors:

• Even with Akachi Onyele, it's still 2 resources + 5 actions (counting the one to play the card) to heal 4 horrors
• With Marie Lambeau who provides Action advantage for Spells, it's still 2 resources at best because you don't always have the ability to trigger the extra Spell action.

What's more, until now, investigators have other ways to repeatably heal themselves without reducing their action count:

• Of course Fearless is that amazing card, as it can already heal 2 horrors during your game and up to 4 after you update theme (Fearless), while helping you pass your skill tests (the backbone of investigators)
• Peter Sylvestre is available to Agnes Baker, Jim Culver and Marie Lambeau

Why do we pay for insurance? It's not a great feeling, having to pay a continuous fee to be insured against a situation that is unlikely to occur and that you're probably trying to avoid in the first place. And yet, just the knowledge of a safety-net can give us peace of mind when dealing with the unknown, and may even prevent missed opportunities due to a fear of the associated risks.

With that clarity in mind, let's talk about Clarity of Mind. This is an insurance card, and you have to be of the mindset that "things are likely to go south" in order to accept this card into your deck. It does nothing to prevent bad things from happening, only the ability to undo their effects. As such, if you take no horror, then this card is useless. Heck, if you're guaranteed to take your sanity threshold minus one horror, this card is still useless. Thus it's efficacy is tied strictly to your likelihood of crossing that sanity threshold, which for mystics, is unlikely, given all but one have eight sanity or more (the one being Diana Stanley, with a still respectable 7 sanity).

...Except it's not unlikely, because mystics have to contend with one more source of horror than normal, on top of treacheries, enemies, locations and the symbol tokens; themselves. Staples like Shrivelling, Ward of Protection, and Forbidden Knowledge, are all cards that leave one extremely susceptible to one bad encounter card or test, and it can lead to the tragic situation where a large portion of these cards that are in play, in your hand, or in your deck cannot be used without being defeated.

As such, Clarity of Mind is an excellent card for enabling a horror incursion deck. Agnes Baker is the most obvious candidate for such an archetype, but it's also a strong pairing with Arcane Research (especially since you can use the spell discount to get upgraded Clarity of Mind). It's basically an auto-include in a Carolyn Fern deck, and the pair of cards Fight or Flight and Meat Cleaver need cards that can sustain their risky play-style. Finally, Clarity of Mind will insure you against some of the upgraded versions of cards that start dealing or deal additional horror; AKA Shrivelling (5), Scrying (3), and Blinding Light (2).

I think this card is fine particularly with Akachi Onyele in 2-handed solo*.

I dont think your going to use all the charges on this card (1 or 2) will probably do the trick (as that's 3 actions). Its not always helpful but losing a turn (2 or 3 actions) to not lose a gator seems worthwhile in a scenario that is spamming horror.

You dont have to wait until youre on the brink to use the card if you are in a scenario that is pressing a series of horror attacks threatening one of your gators you can be proactive (as you may need to replace the arcane slot later).

Again I particularly like this with Akachi Onyele as you can get one or two uses out of the card and than moves the charges to Angered Spirits or swap the card back out with Spirit-Speaker

I dont think the Arcane slots are that big of an issue as you have 2. Simply replace this with the card you need or replace the Arcane slot thats least helpful/empty with this card late game if you are desperate for healing.

Some cards that work well with this card: Prophetic, Uncage the Soul, Torrent of Power...comboing some of these cards trivializes the downside of the card (2-cost and slotting). If some of those cards are already in your deck this add isnt half bad.

Since this is a level 0 card its an easy replacement later on in the campaign: Earthly Serenity.

note: I am still fairly new to the game and providing the review from the perspective of a primarily 2-handed solo player - so take the review with that in mind.