If a unit targeted by Void Seeker leaves the battlefield before Void Seeker resolves (e.g., returns to base), does it still take damage?

Ruling: The unit does not take damage. When Void Seeker resolves, target legality is checked again, and if the unit is not at a battlefield, the damage part won't resolve. You still draw 1 card due to the "do as much as you can" rule.

Sequence:

• Void Seeker targets a unit at a battlefield
• Before resolution, the unit leaves the battlefield (returns to base)
• On resolution, target legality is checked again
• The unit is no longer at a battlefield, so damage does not apply
• You still draw 1 card

Nuances:

• The "do as much as you can" rule allows partial resolution of the spell effect