When used in ways beyond the standard outlined uses, wish carries a risk of stress:
Finally, there is a 33 percent chance that you are unable to cast wish ever again if you suffer this stress.
Assume here that a DM would resolve this using a d100 roll.
Are there any features/abilities in the game that can work to reduce the chance of this happening (either by modifying the roll or by some other method) when using wish in this way?
Best Answer
Make a Simulacrum, have them cast Wish instead
The material costs for a Simulacrum are only an arbitrary quantity of snow and hair/fingernail clippings, along with 1,500gp of Ruby dust. Wish itself is capable of generating an object worth at least 25,000gp, meaning it can generate 25,000gp worth of Ruby Dust (or a 25,000gp Ruby that can then be smashed into dust).
Meanwhile, Simulacra are required to obey their creators, both in actions and intent:
So you sequence things like this:
Using this process, only your Simulacra will risk losing the ability to cast Wish, while you, the original caster in full control of these Simulacra, will never need to risk your own use of the spell.
Disclaimer: DMs reserve the right to make Simulacra used in this manner revolt and turn against their creators. This may happen even though the explicit rules written by WotC expressly forbids them from doing this. I claim no responsibility for any "Fighting my Evil Clone!" Campaigns that get sprung forth by this obvious abuse of game mechanics.
Adventurer's League does not permit this.
The FAQ for Adventurer's League play is rather explicit about this exact combo:
So this combo is not permitted in AL play.