Gum-Gum Champion Rifle (EB01-028) - Extra Booster: Memorial Collection Foil

[Counter] If your Leader has the [Impel Down] type, up to 1 of your Leader or Character cards gains +2000 power during this battle. Then, your opponent returns 1 of their active Characters to the owner's hand.
[Trigger] Return up to 1 Character with a cost of 3 or less to the bottom of the owner's deck.