Fireball is a sorcery widely considered the standard for "X-damage" spells, and was one of the first (among two) X-damage spells printed (the other being Disintegrate). It has been printed in eleven different sets: Alpha, Beta, Revised, Unlimited, 4th Edition, 5th Edition, Beatdown, Darksteel, Magic 2010, Magic 2011 and Magic 2012. Fireball is favored by many players for its ability to damage multiple targets.
Similar cards are Disintegrate, Demonfire and Banefire.