Curse Guy, Master of Curses

Whenever Curse Guy, Master of Curses enters
the battlefield or at the beginning of your
upkeep, search your library for a curse card. Put
it onto the battlefield attached to you.
When Curse Guy leaves the battlefield, for each
curse card attached to you, attach it to target
opponent.
By enduring so many misfortunes for so long, he has learned how to turn any loss to his gain.