One of my favourite new cards, especially useful on high difficulty where test difficulty can get wild.
TL:DR. The straight up 1/turn accuracy boost can be phenomenal and the damage boost is far from shabby.
So, delving into it a bit, 3 cost for a card that is supposed to deal damage, but is'nt actually a usable weapon in of itself, that's steep! There is a lot of opportunity cost here, the two willpower pips make it bearable as a dud because at least it can shield you from treacheries. Also there is the fact that a second copy is, probably, a dud, if you get into the spot where you're equiped with one ecnhanted weapon in each hand youre officially in "win-more" mode.
So, now that I've established that Enchant Weapon is rather bad in vacuum, lets see what good it does. What you get depends on what you've enchanted.
With an inaccurate weapon, .32 Colt or Knuckleduster for example, this thing bridges the gap quite a bit, land the hits, keep moving forward.
With an infinite use weapon like Machete you'll really be able to just keep going and going and going. Commit the Enchant Weapon on your first attack to land one hit, commic a skill card for the second, efficiency!
With a weapon with undependable damage or limited charges, you can nail exactly the damage you need on a case by case basis, killing a 3-health enemy with one .45 Automatic shot, or saving your Enchanted Blade charges against 2 health foes and retaining access to 2 damage hits once the charges run out, or guaranteeing the kill with a Blessed Blade when you're not willing to risk fishing for a . Pump a Lightning Gun to 4 damage and blitz some monsters!
Usually when you're adding to stuff, you'll only want those cards for the characters with literally maximum , but the multifaceted benefits of Enchant Weapon mean that characters with middling can give this card a fair try, a roundly +3 to fight for Roland Banks or Mark Harrigan, a Becky centric Tommy deck will really love it, also Nathaniel Cho can use it to fish out a 2-damage attack with his Gloves without spending a precious event.
Obviously, a higher makes it a little bit better, Sister Mary becomes a reliable hitter with this in play, with card's like Physical Training to back her deck up you can get a rather dependable Mary combat build once set up.
Finally if you're building a straight up support character, an Enchant Weapon can be played for firendly characters too, Carolyn Fern can pack this and use it to pull out a roundly 3 damage hit with a pistol, or play it on behalf of someone else.
All in all, I think Enchant Weapon is going to be a relatively common upgrade among character's henceforth, and once in a blue moon you might encounter a Paralell Agnes Baker doing something weird.