136.3. A card’s Might Bonus modulates the Might of the card to which the card that has the Might Bonus is Attached . See rule 716 Attachment for more information.
136.3.a. The Might Bonus is applied while Attached and stops applying as soon as the card with the Might Bonus is no longer Attached.
136.3.b. If the card to which a card with a Might Bonus is Attached has no Might value, the Might Bonus is ignored.