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

[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.
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[Trigger] Return up to 1 Character with a cost of 3 or less to the bottom of the owner's deck.