Fireball

Sorcery    (CMC:1)

Fireball does X damage total, divided evenly (round down) among any number of targets. Pay 1 extra mana for each target beyond the first.

2E • ENMark Tedin

™ & © 1993—1993 Wizards of the Coast

Legal in: Modern,Mirrodin Block,Legacy,Vintage,Freeform,Prismatic,Tribal Wars Legacy,Singleton 100,Commander

Oracle Text (click to copy):

Fireball {X}{R} Sorcery Fireball deals X damage divided evenly, rounded down, among any number of target creatures and/or players. Fireball costs {1} more to cast for each target beyond the first.

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12/1/2004
The additional cost is paid when you pay the rest of Fireball's costs, even though that text appears second on the card (to make the card easier to read). The additional cost doesn't count toward Fireball's converted mana cost.
12/1/2004
If, for example, X is 5 and you choose three target creatures, Fireball has a total cost of  (even though its mana cost is just ). If those creatures are all still legal targets as Fireball resolves, it deals 1 damage to each of them.
5/1/2009
You may cast Fireball with zero targets, regardless of the value chosen for X. If you do so, it will not be a targeted spell, and no damage will actually be dealt when it resolves.
10/1/2009
Fireball's damage is divided as Fireball resolves, not as it's cast, because there are no choices involved. The division involves only targets that are still legal at that time.
10/1/2009
You can target more than X creatures. However, if the number of legal targets at the time Fireball resolves is greater than X, none of them will be dealt any damage.

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Card Fireball is not on TCGPlayer.