The stone he put in its place looked almost exactly like Jon's stone, except that it wasn't. It was The Selfless Stone.
It worked just like the normal stone, except that when the wisher made a wish for himself/herself, the wish would instead be granted to everyone else within the range of the stone.
For example, if Jon said "I wish I was sexy," then the stone would grant the wish as if he had said "I wish everyone except me was sexy."
But any wish that the wisher makes for someone else will not be affected.
For example, if Jon said "I wish Karyn was smarter," then the stone would grant exactly what he said, since it was a wish for someone besides himself.
