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Slifer the Sky Dragon does not have an official passcode.
There is currently no game-legal version of Slifer the Sky Dragon.
The theme song for when Yugi summons Slifer the Sky Dragon in the Pyramid of Light is called Slifer The Sky Dragon Theme.
Slifer The Sky Dragon goes up to $75
Obilisk the Tormentor, Slifer the Sky Dragon, and Wing Dragon of Ra.