Hirudegarn, Catastrophic Combination

: ＜Hirudegarn＞ card with an energy cost of 3.
When this card is played, choose up to 1 of your opponent's Battle Cards with an energy cost of 4 or less and return it to its owner's hand.
(You can only activate this skill once per turn across all copies of this card.) , if your opponent has 4 or more energy : Choose up to 1 green ＜Hirudegarn＞ card with an energy cost of 6 in your hand and play it on top of this card.