Egyptian God Cards

The Egptian God Cards are supposedly the strongest monsters in all of Yugioh. The 3 god cards are Slifer the Sky Dragon, Obelisk the Tormentor, and The Winged Dragon of Ra. They each have also have a special ability. The god cards cannot be obtained in normal booster packs; they were released as promos. They are also banned (even though they are not on the ban list).