wotc
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 as Fireball resolves.
MTG · Card
◇ Catalog #150
Fireball
cei·#150·common·nonfoil
Illus. Mark Tedin
—
in vault
—
for trade
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wishlisted
Dec 1993
32 yr ago
Value
$14.99+$0 (+0.0%)
30 days high $14 · low $14
Volatility · stable
USD$13.99EUR€5.12
NM$14.0
Where to buy / sell
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Played in EDH
EDHrec rank #4,323 · Niche pick
Variants
Gameplay
Sorcery
This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.
Legalities
tlrlegal
duellegal
brawlnot legal
pennylegal
PreDH
Rulings · 4
wotc
For example, if X is 5 and you choose three target creatures, Fireball has a total cost of {7}{R} (even though its mana cost is just {5}{R} and its mana value is 6). If those creatures are all still legal targets as Fireball resolves, it deals 1 damage to each of them.
wotc
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.
Notes
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Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Mark Tedin
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.