Mission Card "Earn Experience Points!" (H-BT03/0075EN) (H-BT03)

[Set] (This card remains on the field.)
When an item on your field attacks, put the top card of your deck into this card's soul face down.
[Act] If there are four or more cards in this card's soul, put this card into your drop zone. If you do, choose an item on your field, and for this turn, that card gets Double Attack!
You may only [Set] one "Mission Card "Earn Experience Points!"" on your field.