Does Thousand-Tailed Watcher's might reduction affect all units currently on the field or is it a passive effect on new units? If a unit's might is reduced and then increased by another effect, does it stack or stay at the reduced value?

Ruling: Thousand-Tailed Watcher only affects units currently in play when it enters. Might modifications stack - if a unit is reduced to 1 might by Watcher and later increased by 2, it becomes a 3 might unit.

Sequence:

• Watcher enters and reduces might of all units currently in play
• Later might modifications apply on top of the reduced value
• Example: 2 might unit reduced to 1, then increased by 2, results in 3 might

Nuances:

• The effect is not passive; new units entering after Watcher are not affected
• Might modifications are cumulative, not overriding