Does that mean that if there are more tokens than tokens, you wouldn't be able to play it?
Since you can't search the bag for X tokens with X being greater than the total number of tokens?
Example:
Total tokens in bag = 4
Total tokens in bag = 3
X = 4

Can't search for 4 tokens since there are only 3 in the bag - does this mean that you'd not be able to play Harmony Restored?

Is there an official ruling on this? or am I completely reading it wrong to begin with?

After a campaign with this in Winnifred I think the card can be a pretty nice addition to a Taboo'd Rogue deck in 3-4 player games assuming you're going to be doing evading with any amount of frequency. Extra actions with low cost are always worth considering, and in the right situation this can save you up to 3 for just the cost of committing a card to a test. While you don't get free reign on what those actions are spent on, move actions are fairly commonplace and if you have this card in your hand for a full scenario there's definitely going to be some situations where it'll do its baseline effect and save you one move action that you were going to spend after evading. In those situations I'd argue that this card is already pretty good. And there'll be some situations where it'll save you 2 or 3 actions, in which case this card is incredible.

Now the effect isn't universally great and there'll be some situations where it'll spend half the scenario sitting in your hand before you get value out of it. As such, I think this is a card I would generally not run more than 1 copy of because drawing 2 when you really don't need the effect can slow you down a bit. But if you're someone who expects to be testing Agility a lot and especially if you're playing with 3-4 players where being able to move to an ally's location has a lot of value, I think you should try running a copy.

Also just want to say that while Quick Thinking is going to generally be better than Nimble, it's one of the best Rouge cards in the game and you're only allowed to run 2 copies of each card. I think there's a lot of decks that are interested in a more situational Quick Thinking-type effect to run in addition to the two copies of Quick Thinking they already have.

In case if you're wondering "Which firearms this can be used with?" — here's a link to handy list.

It's funny to think about Jenny's Twins or Joe's colts with a telescopic sight...

UPD 06/28/2021: WOW! New Taboo is a game changer, they've dropped "Attached asset cannot be used to attack enemies engaged with you." part, so we can attach this to a Lightning Gun and go bananas!

Spoilers for "The Circle Undone" campaign

Tony leaned against the Church door, breathing heavy. The wailing dead filled the air, pouring in and out of the fractured sky as reality itself buckled under the weight of the Silver Twilight Lodge's hubris.

"I am so tired," the bounty hunter whispered, feeling the culminated trauma of the last week's events spill over his body.

"Tony Morgan." Carl Sanford walked down the road, the unhallowed spirits parting from the old man's path. "I had such faith in you, lad. You could have been one of the greatest Knights in the Lodge's history. An exemplar in our moment of triumph! Instead, you are an ant..." he inhaled and reality flexed around him. "... where I have become a god."

Tony forced himself to his feet. "It was a pretty good plan, Carl. But you forgot one thing."

"And what is that?"

With the speed he had built his entire reputation around, Tony pulled Lupara from his coat. Sanford barely had time to register the weapon before she sang her violent song twice. The old man fell to the ground, screaming as he clutched at his bloody legs.

Tony blew smoke out of Lupara's twin barrels. "Gods don't have kneecaps."

10/10 would kill endgame boss in one turn again.

This is a solid little card for healing horror. Yes, it only heals one horror, it won’t have a big impact on the game, but healing one horror for only one card is very efficient. Not every card in your deck can be a powerful card that costs actions and resources, you need some cheap ones too. The one Will icon may not look like much, but the point of this card is that it does something that normally costs significant resources (healing), and does it with very little cost – few other cards are as efficient as spending 1 card, 0 actions, 0 resources, and 0 xp, per point of healing.

This is by no means a card you must include in your deck. It is simply a solid option to consider if you decide that your character needs a little bit of horror healing.

Usually you can hold off on using Fearless until you get a test where multiple chaos tokens would become successes with the +1, making the test likely to pass, and gaining a noticeable benefit from the skill icon on top of the horror healing.