Put a Fairy Wisp token into your EX area. Give each Pixie token on your field +2.
While this card is on your field, each Pixie token on your field has Storm and Assail.
Whenever a Pixie token is put onto your field, give it +2.
QI have a Fairy with Storm on the field due to this follower's passive ability. If I use it to attack an opponent's leader, and an opponent destroys this follower with a Quick card such as Execution, will my attack still go through?
AYes, it will.
QIf I can't put a Fairy Wisp token into my EX area, do I still give each Pixie token on my field +2 attack?
AYes, you do.