If a unit has taken damage equal to its current might after being reduced by Orb of Regret or Stupefy, does it die during that spell's cleanup?

Ruling: Yes, when a spell like Orb of Regret or Stupefy reduces a unit's might to equal the damage it has already taken, the unit dies during that spell's cleanup phase.

Sequence: (for the chain example)

• Stupefy resolves first (LIFO - last in, first out)
• During Stupefy's cleanup, the unit dies because damage now equals might
• Call to Glory resolves with no effect (target is dead)
• Orb of Regret resolves with no effect (target is dead)

Nuances:

• This works the same way whether the might reduction comes from Orb of Regret or Stupefy
• Damage persists on units at battlefields (no cleanup between turns)
• When spells are chained, they resolve in reverse order of being cast