Quite the sick single-handed weapon. Its direct comparison is to the Machete and of course this is purely better statistically. As it should be for 5 experience. When you break it down, it has a better bonus to hit than the machete and always provides a bonus damage. Whereas the machete only does the bonus damage if they are engaged with you (problem if on someone else and you need to do multiple damage or an evaded enemy) and only if it is the only thing engaged with you.
The cost is high for this weapon at a cost of 5, and the experience rivals that of the Lightning Gun. But we are talking about a weapon that doesn't have an ammo limit, and only takes up a single hand. Comparing firearms to handheld weapons isn't typically something done lightly. The firearm should have the advantage at these direct comparisons. But even so, once per game you can still swing very strongly with this weapon at something scary. Often you will only need to be making one or two hits like this per game anyway as a necessity. That is the problem that arises from something like a firearm. You occasionally run across something you might not want to waste an ammo on, but find yourself doing so anyway while you wait for the proper target or you try to deal with them hand and fist. This weapon has the advantage of waiting for that moment and then unleashing upon it. And you receive an excellent benefit of filling your hand with useful cards upon completion. Zoe obviously stands out with the will and str 4 that would provide for a serious swing when something shows up that needs to be cut down.
This should be up there with the most powerful weapons in the game if it is not the one at the top.