I don't have the spell in my games. I've used Wish as a reward at the end of a save-the-world campaign. The party got the standard 3 wishes and since it wasn't the spell, I was able to put some guardrails on it to prevent foolishness. They spent almost an hour discussing and debating before presenting 3 thought-out and balanced wishes that they felt were adequate rewards for their accomplishments.

(Campaign was over but I used their party as legendary NPCs in the world until we no longer played in it.)