When a unit receives a negative might modifier (like -3 from Thousands-Tailed Watcher), does that modifier persist through phases, or does it snapshot the unit's might at the time it's applied?

Ruling: Effects that apply a minus or plus might modifier (like Watcher or Stupify) snapshot the might at its current value when applied. They do not persist as ongoing modifiers.

Sequence:

• Clockworker Keeper starts at 2 might
• Thousands-Tailed Watcher applies -3, setting it to -1 (snapshots current value)
• During attack phase, Yi gives +2 to Clockworker Keeper
• Clockworker Keeper is now at 1 might (base 2 + Yi's +2 = 4, not -1 + 2 = 1)

Nuances:

• The negative effect does not "linger" - it modifies the unit's might once at the time of application, then that becomes the new base value for future modifications