I don't know if it is a bug or not, but I cannot test Number 78: Number Archive against the computer because the computer does not choose the card at random. Instead, it always seems to choose the "last card" in your Extra Deck from the deckbuilding screen. In that way, you can either stack what you're gonna get, or get absolutely nothing.
Again, I'm not sure if you'd call this a "bug" or not since the card works fine, but it's more the fact that it is completely worthless/a blowout against the computer.