A tried-and-true favorite of many wizards, whatever their school.

Magic Missile

This spell can't be countered.
Magic Missile deals 3 damage divided as you choose among one, two, or three targets.

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Adventures in the Forgotten Realms

If Magic Missile has one or more targets, and some (but not all) of them are illegal as Magic Missile tries to resolve, the amount of damage dealt to the remaining legal targets doesn't change. If all targets become illegal, Magic Missile won't resolve.

You divide the damage as you cast Magic Missile. Each target must be assigned at least 1 damage.