Contagious Weakening Gas (X-BT04A-UB03/0053EN) (X-BT04A)

You may only cast this card if you have a "Plague" on your field.
[Counter] Choose a card on your opponent's field. For this turn, when the chosen card attacks, put a card from your opponent's gauge into his or her drop zone, and deal 1 damage to your opponent!
If this card is in the soul of a "Plague", all cards on your opponent's field get power-1000, and defense-1000!