Simple game, a person makes a wish. Anyone else can “corrupt” it. Then that person makes a wish of their own, and the cycle continues.
For example:
Person A: I wish I had 1 million dollars.
Person B: Wish granted, but they are Monopoly dollars. My wish: I wish I could fly.
Person C: Wish granted, but sustaining flight requires 500 calories per minute. My wish: I wish I could teleport.
etc.
Wish granted. This causes weapons of mass destruction that rely on fusion tech to be much easier to acquire, plunging the world into a new cold war.
I wish I could shape-shift into any animal at will.