143.2.b. If a unit's Might is ever less than 0, it is treated as 0 when referenced by spells and abilities, and when summing Might to be assigned as damage in the Combat Damage Step. See rule 460. The Combat Damage Step for more information. 143.2.b.1. Although the unit’s Might is treated as 0, it is not 0. Effects that calculate Might increases and decreases use the actual value of the unit’s Might.