Fireball

Text:

This spell costs more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Rulings:

• 11/17/2017 For example, if X is 5 and you choose three target creatures, Fireball has a total cost of <img src="/Handlers/Image.ashx?size=small&amp;name=7&amp;type=symbol" alt="7" align="absbottom" /><img src="/Handlers/Image.ashx?size=small&amp;name=R&amp;type=symbol" alt="Red" align="absbottom" /> (even though its mana cost is just <img src="/Handlers/Image.ashx?size=small&amp;name=5&amp;type=symbol" alt="5" align="absbottom" /><img src="/Handlers/Image.ashx?size=small&amp;name=R&amp;type=symbol" alt="Red" align="absbottom" /> and its converted mana cost is 6). If those creatures are all still legal targets as Fireball resolves, it deals 1 damage to each of them.
• 11/17/2017 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.
• 11/17/2017 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.
• 11/17/2017 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.