Official tournaments stopped allowing these cards, although there have been rumors that certain official tournaments will allow Obelisk the Tormentor by tributing three monsters but Obelisk will have no other effects. Konami responded to this in an FAQ that said these cards weren't to be used.

These were originally released as promotional cards (in Gameboy Worldwide Edition Promos) for people who just wanted to say they had them, but the cards were later used in Duels and complaints were sent into Konami.

The Winged Dragon of Ra (гЂЊгѓ©гѓјгЃ®зїјзҐћз«њгЂЌ RДЃ no YokushinryЕ« - Winged God-Dragon of Ra).

Obelisk the Tormentor (гЂЊг‚Єгѓ™гѓЄг‚№г‚ЇгЃ®е·ЁзҐће…µгЂЌ Oberisuku no Kyoshinhei - Giant God-Soldier of Obelisk).

Slifer the Sky Dragon (гЂЊг‚Єг‚·гѓЄг‚№гЃ®е¤©з©єз«њгЂЌ Oshirisu no TenkЕ«ryЕ« - Sky Dragon of Osiris).

The wielder of these great cards is able to acquire the title of 'Duel King,' but in the wrong hands, they are capable of causing legitimate injury or even death. So he decided that these cards were too powerful to be mass-produced, and had Ishizu bury the prototypes in the Pharaoh's tomb. Pegasus woke up injured after this 'nightmare'. Shadi told Pegasus that he had angered the Egyptian gods. When Pegasus finished the art-work on the prototypes, he was having a nightmare about the cards attacking him.

When Pegasus decided to make them into cards, everyone involved in the project was attacked by the spirits of the Egyptian god monsters, so Pegasus decided to create the cards on his own, under the protection of his Millennium Eye. The Egyptian gods are one-of-a-kind all-powerful cards created by Maximillion Pegasus, who modeled them after three Ancient Egypt divine beasts whose likenesses surround the Millennium Puzzle on the stone tablet said to hold the memories of the nameless Pharaoh.

Egyptian god card yugioh