Arabian Nights actually has many cards reprinted in later sets. Many cards from Arabian Nights were reprinted in Chronicles, the later compilation set. Some other notable cards were reprinted in later Core Sets and expansions. For example, Desert was reprinted in Time Spiral).
Only 28 cards from this set have never been reprinted, and 22 are on Wizards of the Coast's reserve list. Being on the Reserved List means that they will never be reprinted, mainly because of their power level and also to protect their collectors value. These 22 cards remain some of the rarest cards in all of Magic.
Stick around for more Retro Magic, where we look at some of the oldest and rarest cards in Magic: the Gathering!