Search your library and graveyard for five cards and exile the rest. Put the chosen cards on top of your library in any order. You lose half your life, rounded up.
If you love crazy combo decks then start brewing with Doomsday. This card presents some of the most mind twisting mental gymnastics Magic can offer. Somehow, some way, there is a pile of five cards that wins the game. You just have to figure out what it is, but don't mess up, Doomsday is probably the most unforgiving card ever printed.