火の玉
ソーサリー
この呪文を唱えるためのコストは、２つ目以降の対象１つにつき
多くなる。
クリーチャーやプレインズウォーカーやプレイヤーのうち望む数を対象とする。火の玉はそれらにそれぞれ、Ｘ点を均等に割って端数を切り捨てた点数のダメージを与える。
すぐに果樹園には煙と硫黄と焼かれたバグベアの臭い、そしてかすかな桃の香りが漂った。
イラスト：
Commander Legends: Battle for Baldur's Gate#175アンコモン日本語適正
裁定
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.
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.
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.
For example, if X is 5 and you choose three target creatures, Fireball has a total cost of 
(even though its mana cost is just 
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.