419.1.a. This creates an effect that modulates that attribute by that specific amount for the duration specified by the Game Effect that instructed the player to perform this action. Example: A unit with 3 base Might and Shield 2 is in combat as a Defender. Since Shield applies, its current Might is 5. A player chooses it as the target for Last Stand, a spell that reads in part “Double a friendly unit's Might this turn.” Its current Might is 5, so it gets +5 Might this turn, for a current Might of 10. After combat, Shield no longer applies, but the +5 Might from Last Stand does, so the unit’s Might is 8.