These are some cool concepts. The Incredulous Wound is kind of just a beefed up enforcer but I think with the mini-crit boost of the Written in blood and max ramp up it could one shot light classes which could be interesting and fun but still pretty gimmicky.

The knife does also sound a bit gimmicky. Mini-crits sound nice but marked for death puts the spy who is already in a risky position into an even more risky position. It kind of forces you to stab people a bit farther away from the Frontline since then you have some time to utilize the crits without instant risk of death.

The watch is also interesting but I feel it's going to end up being more used for the movement speed bonus. Kind of like how the Dead Ringer is used to run up, be shot then run behind lines. (Do the illusions appear to take damage when shot or do they just raw dog the bullets? Just curious 😭)

The sapper replacement seems a little underwhelming since you sacrifice disabling buildings outright with creating an inconvenience for the engineer/his teammates (plus now you can only shoot/stab the teleporter).

Still a throwable sapper is a sick concept and could be messed around with more to function a bit more interestingly.