

Each Pixie token follower on your field has Storm.
: Select an enemy follower on the field and deal it X damage. X equals the number of cards you've played this turn. Activate only once per turn.
QI play a Fairy and, since it has Storm due to this follower's passive ability, immediately declare an attack with it. If my opponent banishes this follower at Quick timing with a card such as Fall from Grace, causing the Fairy to lose Storm, does the attack still go through?
AYes, it does.