Curse of meta gaming

This spell is so powerful, that only the DM can use it.

Select one Player at the table, who drives you nuts. His PC gets cursed.

Meta gaming of a cursed PC triggers one or more of the following effects (the DM decides witch, how many  and the duration)

- The PC takes damage
- The AC of the player is reduced
- The Player gets a disadvantage on one or more checks
- A magic item, possessed by the PC, losses it's magic abilities
- An ability score of the PC is reduced by one
- Anything else that seems justified to the DM 

The curse can only be dispelled by the DM.