City of Brass

From MTG Salvation Wiki

The City of Brass was a city on Rabiah constructed by Fatima. It was in habited by Efreeti and Fatima's Brass Men. It is a source of power to planeswalkers, providing any color of mana for a price.

[edit] Game mechanics

City of Brass, sometimes referred to as "CoB", was the first land able to produce any color of mana. Originally printed in Arabian Nights, then later in Chronicles and several core sets. It was removed from Ninth Edition in favor of the painlands, to make the set complement the Ravnica block.