When Thousand Tail Watcher reduces a defending Poro's Might by 3 (from 2 to -1, resulting in 1 Might), does the Poro return to 4 Might when the opponent enters the battlefield (due to +1 Defender and +2 Wuju Style from Master Yi), or does the -3 Might debuff continue to apply?

Ruling: Might changes are done as a snapshot, so the Poro goes down to 1 Might from Thousand Tail Watcher's effect, and then returns to 4 Might when the opponent enters the battlefield and the defender/Wuju bonuses reapply.

Sequence:

• Thousand Tail Watcher is played, reducing Poro's Might by 3 (from 2 to 1)
• Opponent enters battlefield
• Poro gains +1 Might from Defender and +2 Might from Wuju Style
• Poro ends at 4 Might total