Does Assault on an attacking unit count towards Mighty for the Conquer effect on a battlefield?

Ruling: No, Assault does not count towards Mighty for the Conquer effect because attacker and defender designations are removed during cleanup before the Conquer effect resolves, which causes Assault to deactivate.

Sequence:

• Attacker/defender designations are removed during cleanup
• Assault deactivates when designations are removed
• Conquering happens after cleanup, so Assault is no longer active