Bonesaw is similar to mechanic’s wrench. They are both single handed melee tool-items. And both will let you do yourself damage, potentially. Vincent's weapon has an updated, better version of the Kukri effect. If he wants to, he can do an extra damage, trigger bandages or Jessica Hyde, then slash again with a fresh On the Mend. Kind of a dark mirror to the meat cleaver.

The secondary effect feels like an emergency button; there are very few effects in the game that can reduce that much damage on someone, especially if you’re healing people steadily to give them On the Mend. Combining that test with premonition, neither rain nor snow, or other downside mitigators is best. If your allies have trauma, it should be because of 'in the thick of it'.

Since it’s a tool, it can go back in your Tool Belt when there’s nobody around to stab. Situationally very useful, which is the sweet spot for a signature card.

Vincent Lee is a very active support character. It’s hard to forget he’s in play when he’s handing you a gory skill card every turn. And he has a very easy way to do it: bandages and scrounging. If you can take the damage, and in certain campaigns you absolutely can, he can heal you and give you that +2 buff.

Vincent may be the most “feature complete“ character with one XP. Once he has Jessica Hyde, Dr. Lee becomes Dr. Jekyll. With his Bonesaw, you can take a damage every round, and get on the mend in time for the mythos phase.

Like Carolyn Fern, he has a secret advantage of giving other investigators three bonus XP at the start of a campaign, because “in the thick of it“ goes from penalty to opportunity.

This card is absolutely insane. For 1 action and 1 resource cost, you could search and selectively draw up to 6 cards. Dropping clues might sound like a heavy burden, but with 2 Research Notes in play, dropped clues potentially double back, so you actually benefits from dropping clues. However, I have only tried this combo on 4 player game and I assume that it doesn't work well on solos or 2 player games.

The discount build-up feature ( once per turn without playing any Item yet) works well when you are playing with firearm-based teammate. While the fighter is using the ammo of their current gun, at the same time you save up the discount for the fighter's next gun, possibly reduced to 0 if enough turns passed. Sometimes when I use Dr. Milan Christopher and continue to get +1 resource every turn yet it cannot help the fighter take the heat off me, I think Charles Ross, Esq. is a great alternative.

This is Rite of Seeking (4) for seekers. Cost the same, same uses, same bonus.

Pros
No downsides for pulling special tokens
No item synergy

Cons
Exhausts on use
No spell synergy
Only gets 2 extra clues if succeed by 2

Other
Uses hands instead of arcane

Should be worse than rite of seeking in most cases.

Thanks to replies for correcting/pointing out simple things I missed!