The three "God Cards" were released as promotional material and tie-ins to the television show. They have nonstandard frames, no printed abilities, nonstandard creature types, and unusable ATK/DEF.
The intuitive answer is that they don't have printed abilities and thus can't be processed properly during a game.
The hard answer is that they are just not game-legal cards and are thus invalid in tournament play.
The result of this is that the card has no value in either a serious or casual game, and is thus worthless.
Winged Dragon of Ra has had a game-legal print too, and it is also fairly worthless due to being hard to summon and not very useful.
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The Winged Dragon of Ra is basically the strongest because while Obelisk and Slifer have a fixed amount of attack points, the Winged Dragon of Ra has infinite.
the Winged Dragon of Ra is not possible to get in a booster pack inEnglish. It has come in the video game Dawn of the Duel.
Winged Dragon of Ra has never been distributed as part of a deck. He can be found in certain booster packs and as a promotional card in a few other things, but not as part of a deck.
The Winged Dragon Of Ra.
The JUMP Winged Dragon of Ra was mass produced, and there is little demand for it. You could probably pick it up for about £5 or so, not much more than the magazine it was given away with.