If a spell targets a unit at a battlefield, and the unit is moved to a different battlefield before the spell resolves, does the spell still affect its original target?

Ruling: As long as the target is still at "a battlefield" (any battlefield), the spell will still affect it and not be mistargeted, even if it moved to a different battlefield than where it was originally targeted.

Nuances:

• If a spell requires multiple targets to be at the "same battlefield" (like Facebreaker requiring a friendly and enemy unit at the same battlefield), and that condition is no longer true on resolution, the spell will whiff and neither target will be affected.
• The spell still resolves even when targets become illegal; it doesn't fizzle (which would imply no resolution at all).