SS2 Trunks, Heroic Prospect (Collector's Selection Vol.2)

Counter : AttackNegate the attack, then play this card.
Permanent During your opponent's turn, if you have a blue Unison Card in play, reduce the energy cost of this card in your hand by 2.
Auto When this card is played, your opponent can't attack with Battle Cards with energy costs greater than their current energy for the turn unless they choose 2 cards in their hand and place them at the bottom of their deck in any order.