From: KEVIN C BLAKLEY [blakleyk@prodigy.net]

Traumatize (Odyssey):  Target player puts the top half of his or her library, rounded down, into his or her graveyard.
 
Morningtide(Torment): Remove all cards in all graveyards from the game.
 
First use Traumatize to get rid of half of your opponent deck and then use Morningtide to make sure that there is no way for them to get those cards back.