You or someone else came across a medallion that gives you shapeshifting powers. However, the shapeshifting powers are time limited!
Once activated, the medallion will disappear. When the shapeshifting powers run out, the medallion reappears. However, when the medallion reappears, the same person can’t just continuously use it. They are stuck as the body/object/animal they were in when the time ran out.
Somebody else must use the shapeshifting powers first. (Example: After person 1’s shapeshifting powers run out they are stuck in their current form, person 2 must use it first before person 1 can use it again) If you set the shapeshifting power to 12 hours, you have to wait 12 hours after the powers expire to use it again. There is no minimum time limit. It's up to the user to 'set' the time limit.
Anything goes with this power. You can shapeshift into other people, inanimate objects, clothing, animals, etc… You can even shapeshift just a portion of your body if you want.
Now, what will the shapeshifting medallion be used by?..