You can be in the home stadium for your favorite sports team winning a championship, but if you accept, they won’t win another championship for 25 years.

If you don’t accept, their chances of winning are unaffected, they may win or they may not, but you cannot attend any championship matches in person- your only chance to witness it in person is by accepting the deal. By accepting you guarantee they won’t win again for 25 years, at which point odds return to normal.