This is silly!
Umbran said:
Make your wish clean and simple and within the power of the spell, and you're fine. Make it clean and simple, and just outside the power of the spell, and you'll get close to what you want. Being an egregious wise-acre to try to avoid any danger from meddling with powers beyond your puny mortal comprehesion, and you are painting a target on your forehead
But what's
within the power of a wish? Ah, there's the rub!
I know many people who subscribe to the 1e philosophy that wishing for magic items is a no-no! You wish for a magical +1 Flaming Scimitar, you get transported to where one is, get to fight its current (probably undead) owner, and then get to try to find your way back!
You wish to be permanently immune to all forms of draining attacks? Some GMs would consider that fine, you're just keeping what you've already earned (therefore, it's not greedy). Others would say that it makes too many undead (and other creatures) of little or no threat, and is therefore "beyond the power of the wish", and "zap" you (for being greedy).
It is all very GM-dependent. Worst of all, many GMs who feel that you have "exceeded the power of the wish" will also tell you that you have lost it, and gotten nothing...
And then there was the Killer-DM... He wasn't fair, everyone knew it, and he didn't care! I recall one situation where we had been stranded on the moon as part of the quest for the Rod of Seven Parts, found the piece, and needed to return to Earth. My PC wished us back, and he said:
"Okay you're back on Earth...", and then proceeded to describe how people were looking at us in awe and fear, bowing, etc. Eventually, we learned that we all had purple hair, golden skin, and were glowing brightly... It took three wishes to turn our hair and skin back to their normal colors, and "return us to our normal level of luminosity". Ross really loved "side effects" unrelated to the wish.
So, what's an okay wish in one campaign will be "outside the power of the wish" in another, and get you killed in a third. So it's pretty silly to just expect the players to know what's acceptable, to you!
Give'm some guidelines on what they can and can't do. Let them know if you punish greed, only "excessive" greed, and how you define "excessive". Give them some limits on power, and examples to judge by. Better yet, let them ask "If I wished for (X), would that be okay?" That's probably the best way to handle it.
Myself, I generally won't let folks wish for magic items, unless they want to be transported to wherever it is that an unoccupied one is (undead don't count as occupants). I would let them wish to be immune to draining attacks, though. Other GMs will be exactly the opposite (not being 1e players). Some will allow both... or neither. A few GMs will only allow wishes to be used in order to further the adventure at hand, or heal or raise party members!...
So, what's "beyond the power of the wish" all depends upon the GM. I've seen a few try to claim that emulating the effects of a seventh level spell was!
