When a spell deals damage equal to a unit's might (e.g., 3 damage to a 3 might unit), can you use a reaction to boost the unit's might and prevent it from dying?

Ruling: Yes, you can respond with a reaction (like Discipline) to boost a unit's might and prevent it from dying when damage is assigned to it.

Nuances:

• Units have only Might, not separate attack and health stats
• A unit dies if it is assigned damage equal to or greater than its Might
• "Buff" is a specific game object that gives +1 Might and stays until removed by a card effect
• "Boost" refers to Might increases from non-Buff sources (like spells or abilities)
• Most spell-based Might increases last until end of turn
• Some abilities give conditional Might increases (e.g., while a unit is at a battlefield)
• A unit can only hold one Buff at a time; attempting to Buff an already Buffed unit does nothing