Can you play Cull the Weak if you have no units?

Ruling: Yes, you can play Cull the Weak even if you have no units.

Sequence:

• Cull the Weak is played and finalized onto the chain without requiring a valid unit at that time
• On resolution, both players choose units

Nuances:

• Cull the Weak does not target, so the choice happens on resolution rather than when finalizing the spell onto the chain
• You don't need to have a valid unit to choose from when playing the spell