Maybe it's the card that will make me play Well-Maintained at last: I play a firearm, attach Well-maintained to it then a few other upgrades, use all the ammo, discard the firearm, get it back to my hand and finally use Primed for Action to replay it with a single upgrade in a single action at -2 resources.
Joey "The Rat" Vigil gives you a way to discard the firearm and get resources, Custom Modifications with Counterbalance checked gives you additionnal card draw.
I have re-checked the erratum on Wendy's Amulet but I don't think it prevents the below interaction to work.
In a 2+ game, give it to your main fighter in addition to On the Hunt: during the mythos play On the hunt, spawn the enemy, use The book of war, defeat the enemy, get your resources, and at the end of your turn get On the hunt back.
Replay each time you need an enemy (for Parley effects, Under Surveillance, Ambush, ...)
In a Zoey Samaras deck you can even kill the enemy when you engage it thanks to the Zoey's Cross. Especially interesting for Aloof or Cultist enemies: Acolyte, Whippoorwill, ...
P.S: if this combo doesn't work due to the fact that On the Hunt is not discarded right away, there is the inferior combo with On the Hunt / Kicking the Hornet's Nest (you need to find an enemy among the first 9 cards of the encounter deck.
Another Neutral card that folks should consider? (I swear I'm not biased to Neutral cards, cough Bide Your Time)
But I imagine most people miss-read this card as I had for unlike Easy Mark's After effect, other investigators can chain off teammate's Short Rests as well. So, this card gets kind of wonky to evaluate if multiple investigators in a team run multiple copies of the card as it can be 1 action heal X from any ally/investigator at your location with X being how many resources/Short Rests are in your collective hands at that location.
Now is the effect that amazing for a 4-player group to run up to 12 copies of Short Rest? I mean dedicating ~10% of each player's deck and 12 resources is quite a lot even if you save on the action side. At that point some might argue you might as well run some Teamwork shenanigans. Yet you don't have to aim for 12 as even if all 4 of you just had 1 copy at one point: 1 action and 4 resources/cards from the group to heal 4 from your most wounded teammate(s) is pretty good for a lvl 0 card.
One example that immediately came to my mind upon this re-examination of the card is everyone's favorite student Amanda Sharpe and veteran Mark Harrigan. Can easily see both of them drawing a lot then spending 1 action and 6 resources to heal themselves back up. Even if Amanda doesn't need the healing, she can dump it on Mark. Any high draw investigators should heavily consider this card, especially if you are going in as a group.
Whether this After effect was intended by the designers to encourage people to proxy more of their Knifes or push more Drowned City expansion sales for more copies remains to be seen.
It seems obvious to say it but there is a class (the survivors) who can use cards from the discard or even want cards in the discard, so Bound for the Horizon can be considered with Wendy Adams, "Ashcan" Pete, Calvin Wright, Silas Marsh, or George Barnaby if you intend to play with your discard.
In a Wendy Adams deck, you can still play the card you have just discarded if you have the Wendy's Amulet in play.
For others, it's the opportunity to have the Improvised events in the discard without playing them from the hand first.
For Monterey Jack (and Ursula Downs to a lesser extent), it's an other possibility to move as a free action and take advantage of the investigator ability.
Really great for Zoey Samaras:
At 2+ player you can also ask a seeker to play Existential Riddle on a Creature / Monster hunter enemy so that you have the double bonus all the time (as long as you move only one location perround).