Once the ability resolves, the bonus won’t change later in the turn, even if the number of other attacking Allies does.
25-08-2015
wotc
Count the number of other attacking Allies as the ability resolves to determine the size of the bonus. Attacking Allies controlled by a teammate will count toward this total.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.