it depends on whether you are using the new legal cards or the traditional cards from the anime released as a promotion to a game-boy game (don't know which one).
The point being the latter are far more powerful and the legal Egyptian god cards are not worth buying when you can get the unofficial anime TV series wicked gods which seem to be far more powerful (specifically wicked avatar). and in case your wondering with the traditional effects of the Egyptian gods they are by far the most powerful cards in the game.
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The Winged Dragon Of Ra.
The most powerful monster in yu-gi-oh is known as "The Winged Dragon Of Ra" it far more powerful than either "Obelisk The Tormentor" or "Slifer The Sky Dragon".
obelisk
you cannot use ra in a yugioh duel because the back is not similar to the cards. the ra card is yellow and its totally different from the anime series. Ra's card has no rules text, and has 'This card cannot be used in a duel' in either English or Japanese, depending on which print it is.
I'm sorry, but Ra can't be used because no one knows all the effects of the mighty card.