BT12-039 Gokuumon

[When Attacking][Once Per Turn] Until the end of your opponent's turn, 1 of your opponent's Digimon gains <Security Attack -1>. (This Digimon checks 1 fewer security cards.)

When you would play this card from your hand, if your opponent has a Digimon with <Security Attack> in play, reduce the play cost by 3.