After 4 years, I finally spent some time figuring out how this card works. The maximum damage you can deal is the same as with basic attacks: 1 damage per action. But attacks only deal damage when they hit, and the Kukri increases the odds of hitting, in some situations more than others.

This would be easier with a chart, but lacking that option, here is the INCREASE in average damage per action that the Kukri gives you over a basic attack, using the standard difficulty Night of the Zealot chaos toke pool with one ghoul at your location:

A. Only 1 action used (attacking once only and not using the extra action effect)

1. -2 BASE combat advantage over enemy (e.g. 2 combat investigator against a 4 fight enemy): 0.0625
2. -1 advantage: 0.125
3. 0: 0.375
4. +1: 0.1875
5. +2: 0.0625
6. +3: 0.0625
7. +4: 0

B. 2 actions used (attacking twice and using the extra action ability when possible)

1. -2: 0.117
2. -1: 0.219
3. 0: 0.492
4. +1: 0.264
5. +2: 0.117
6. +3: 0.092
7. +4: 0.029

C. 3 attack actions

1. -2: 0.131
2. -1: 0.234
3. 0: 0.482
4. +1: 0.248
5. +2: 0.104
6. +3: 0.083
7. +4: 0.021

D. 4 attack actions

1. -2 advantage: 0.138
2. -1 advantage: 0.245
3. 0 advantage: 0.50
4. +1 advantage: 0.265
5. +2: 0.118
6. +3: 0.092
7. +4: 0.029

As you can see, with this example the extra damage over basic attack tops out at around 0.5 damage per action. The extra damage is mostly due to the +1 combat bonus, and is maximal when your base combat is equal to the enemies fight. The extra action ability does add a bit more average damage (compare A. to B. above), especially when you are at a bigger skill test disadvantage. These statistics are specific to the Night of the Zealot chaos token pool since there are lots of -1 tokens, so this needs to be modified for each situation, but should give you the general idea.

How do these statistics compare to other weapons? The most reasonable comparison would be against another 1-handed weapon with only non-expendable uses, such as the level 0 switchblade, which deals the following extra damage per action over basic attacks:

1. -2 combat skill advantage: 0
2. -1: 0
3. 0: 0.0625
4. +1: 0.125
5. +2: 0.25
6. +3: 0.625
7. +4: 0.8125

In this comparison, the Kukri deals a bit more damage (up to about 0.43 extra damage per action) when your base combat is equal to or lower than the enemy fight value (where you are dealing ~0.2-0.8 damage per action), while the Switchblade deals more damage (up to about 0.8 damage per action more) when your combat is higher than the enemy's fight value (where you are dealing up to 1.75 damage per action). So the switchblade is more useful in the hands of a high combat fighter, while the Kukri helps the low combat investigator more.

Others have often compared the Kukri to the Knife, which is more difficult since the knife has a one-time effect. I will just summarize by saying that the extra action ability on Kukri does increase the average damage slightly over knife, so the choice depends on whether you want to have the single powerful knife effect or slightly more damage over time and a weapon that stays in a hand slot.

I wish they'd made this Campaign Mode Only.

For standalones, this is a no-brainer. 10 resources with no consequence is broken. In standalone any other Rogue economy card is pointless compared to this.

I've played a few Rogues in standalone since this card came out and decided I'd house rule it to be Taboo in standalone.

Jake Williams saved me from bad starts already two out of the four scenarios that I played with Ursula Downs. I bought Miskatonic Archaeology Funding first, so I can run Dr. Milan Christopher and Whitton Greene at the same time. Last scenario I had all three of them out at the same time. One move action yielding two cards, a clue and a resource? yes please!

The first ability just adds security in multiplayer games. Often I would say "Don't worry about enemies spawning at me, I'll bring them to you!" This saved quite some actions where one of the fighters might have come over to safeguard. The ability is good with Archaic Glyphs to also investigate and evade after a move. Great flexibility there.

Since the errata, it's hard to work out who the real Queen to use this pendant is.

Currently I think it might be Amanda Sharpe.

Using Enraptured behind Amanda Sharpe, you can try to keep your pendant topped up with charges and preventing it from removing itself from the game. Also, with Amanda's additional card draw (or rather card filtering) from her ability, she can see those Segments of Onyx faster than other investigators, without even trying.

TLDR: David Renfield and Well Connected are good level 0 card options

The Dunwich investigators just get more and more complicated to build decks for. As more cards come out, the possibilities for their 5 level 0 cards just keeps increasing. Two fun ones to consider are David Renfield and Well Connected.

Ashcan's ability lets you ready an asset once per turn. Now of course most of us see Duke as the 'real target' for that ability, but it does work for any asset. David Renfield is a very powerful way of piling up money, and even better when you can use him twice a turn to really fine-tune the amount of time before the doom threshold goes over.

Once you've amassed loads of money, you can now use well connected to easily be at +4 to any test, twice a round. Considering Duke gives an effective +2 skill, once you hit 15 resources, then well connected becomes a better option in a lot of cases. This doesn't mean Duke does nothing though, they're still useful for a 2 damage attack or a 'Move-stigate', and they still also give you that +2 skill.

There are many level 0 card options, here's a couple I tried together, enjoyed, and wanted to share :)