Does Legend Ahri's -1 might effect persist on a unit after it has been applied, or does it reapply if the unit's might changes?

Ruling: Ahri's -1 might effect applies once when the attack is initiated and does not reapply if the unit's might changes later in the turn. If a 1 might unit is reduced to 1 might by Ahri, then receives +1 might from another effect, it will be at 2 might.

Sequence:

• Ahri's on-attack trigger resolves first when a unit attacks
• The -1 might is applied to the attacking unit(s)
• Any subsequent might buffs are added to the current might total
• Reactions or actions played in response to the attack resolve before Ahri's trigger

Nuances:

• Ahri's effect would only trigger again if the unit is moved to another battlefield or moved from and back to the same battlefield, initiating a new attack
• If multiple units attack together, each attacking enemy unit receives -1 might
• Players should wait to play buff cards until after Ahri's effect resolves to maximize the unit's might