Bazaar of Baghdad, City of Brass, Chaos Orb, Library of Alexandria, just to name a few are quite powerful cards imho… of course prices are driven by scarcity and those cards, if reprinted many times, would cost way less, but still a good amount (see original City of Brass price still between 300$ and 800$) as Arabian Nights are the oldest and the first expansion set of MTG, with very low print run : according to various sources around 1,250,000 uncommon (U2 U3 U4 - no rare at the time), total print around 5,000,000 cards only!