When does the game check if a unit is dead during a reaction chain? Specifically, if a damaged unit receives a negative Might modifier that would make it lethal before a positive Might buff resolves, does the unit die before the buff can save it?

Ruling: Units with lethal damage are killed during cleanups, which occur after every item in a chain fully resolves. If a unit becomes lethal after one effect resolves, it dies during the cleanup before the next effect in the chain can resolve.

Sequence:

• Opponent plays Smokescreen, reducing unit to 1 Might with 3 damage
• Smokescreen fully resolves
• Cleanup occurs, checking for lethal damage
• Unit is killed (1 Might with 3 damage is lethal)
• Discipline attempts to resolve, but unit is already dead
• Discipline's draw effect still resolves (does not reference the unit)

Nuances:

• Effects that don't reference the dead unit can still resolve fully ("do as much as you can" rule)
• When a unit dies mid-chain, later effects referencing that unit return null for its properties