If a unit with a buff increasing its might is reduced by Smokescreen, then the buff is removed, what is the unit's final might? Can might go negative?

Ruling: Might can technically be negative but is treated as 0 for all purposes. A unit with 0 or negative might does not die unless it has damage.

Sequence:

• Start with base might and apply all modifications (buffs, debuffs)
• Might value is always computed arithmetically and can go negative
• The negative value is treated as 0 for all game purposes
• If the unit later gains +1 might, it adds to the actual negative value (e.g., -2 becomes -1, not 0 becomes 1)

Nuances:

• A 0 might unit only dies if it has damage
• With effects like BF Monastery where you remove a buff to draw, if the unit has damage equal to or exceeding its health from the buff, it dies because the conquer happens before the clean