This deck is a combo deck. It has the ability to infinitely mill your opponent, infinitely exile your opponents' library, gain infinite life, make infinite creatures, deal infinite damage, destroy infinite permanents, exile infinite creatures. But you don't have to feel guilty as it is a (set of) 4 card combo(s).

There is a more detailed descript here:http://forums.mtgsalvation.com/showthread.php?t=530283