I cannot recommend enough playing Midwinter Gala near the start of a campaign to go hunting for incredibly fun story assets like this one. You know how Zoey is a really powerful investigator because she solves Guardian's resource struggles just by doing the thing that a Guardian needs to do? With Archibald, anyone can be Zoey, with the ability to gain resources for engaging and turn those resources into bonus damage.
This deck lets you solve multiple problems that Guardians face, single-handedly fixing your economy and smoothing out the curve of when you face enemies. Sometimes as a dedicated monster-hunter you have a turn where there just isn't much of value to do, and Archibald lets you face an enemy now, when you're ready for it, rather than later when you might have more on your plate. It's also fantastic when you're on the hunt for that victory point enemy that you're hoping to take out before the game ends.
In the right deck, Archibald Hudson can be absurdly powerful and fun. He's particularly powerful when combined with the Runic Axe's Inscriptions of Fury, which can make it worth searching for bonus enemies even if you're already engaged.
The best part is it's relatively low risk since the enemy starts out exhausted!
The arrow action should be used sparingly, but it can let you heal an ally and save an ammunition on those pesky 3-health enemies.
Consider the following scenario from the game I just played: Zoey has a Runic Axe and Archibald Hudson out. During the mythos phase, both she and her partner draw enemies. On Zoey's turn, as a free action before she starts fighting she goes searching for another enemy and finds a swarm of spiders, earning 3 resources from Archibald and another three from her own ability. Now, with three enemies engaged on her, she swings the axe with inscription of fury (and an inscription of the hunt to engage her partner's enemy) and with a single blow knocks out nine spiders within a single turn, at no extra action cost over what it would have taken me to get the first enemy.