Can you play a spell that kills a unit on each side if there is no unit on your side?

Ruling: Yes, you can play the spell even if a player doesn't have units because the spell doesn't target.

Nuances:

• You do as much as you can when resolving the spell
• Spells that don't require targets can be played even if the full effect cannot be completed
• This is different from spells that target specific units, which require valid targets to be played