Can you cast spells without a valid target, such as Void Seeker or Acceptable Losses?

Ruling: If a spell needs a target, you must have a valid target to put it on the chain. However, spells that don't target anything (like Acceptable Losses) can be played without valid targets.

Nuances:

• Acceptable Losses doesn't target anything, so it can be played even without any gear in play
• Whether a spell requires a target depends on the specific card text