Gokua, the Evildoer (BT13-048) [Supreme Rivalry]

Product Details

[Auto] (1) : At the end of a battle in which this card is used in a combo from your hand or energy, you may play this card from your Drop Area.
[Auto] When this card is played, choose up to 1 of your opponent's Battle Cards with an energy cost of 1 or less and place it at the bottom of its owner's deck.