You're casting a magic spell, making a wish, it's magic that changes probability. Whatever negative thing you imagine, it will never happen again to anyone in this world. Not good people, not bad people, and it can't be forced on someone by another's will (so no executions or murders.)

There is no limit, so you can stop as many deaths or injuries as you want, it can be as specific as you want, you can also choose not to stop any deaths. There are reprucussions. If you say "no one should ever die" then you must also deal with the population.

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I would say, I don't think anyone should ever become injured until their immobile, and die of hunger due to being unable to move.

Also, no one should ever wake up in a coffin, or be trapped under a rock slide or building, so that they're in an uncomfortable position, dying slowly. Especially, no one should wake up in a coffin unable to move.

Next, no one should have nervous system ailments which cause pain. Pain should only ever come from your body notifying you of an injury, it shouldn't exist as a glitch of your nerves. That must be unimaginably painful. Ideally, people would learn to use their will power to ignore or turn off pain which they're already aware of, like how you can't tickle yourself. In otherwords, things like pulling out a splinter or getting a shot shouldn't hurt (I think that's already basically possible with some pain management training.)

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It's a hard game. Now that I've written out mine, I realize: What happens if someone gets trapped or immobilized? I said no one can die that way, will they just be there for eternity, starving? Isn't it good that we can eventually die in situations we don't want to be in, where no one can come to save us? What if someone gets trapped in a building that doesn't get uncovered for 100 years? Will they go crazy, will they even be the same person?

Ultimately, I probably wouldn't make the wish. Try to corrupt each others wishes.