Swords of Revealing Light (LEDD-ENA25) [Legendary Dragon Decks (2020 Date Reprint)]

After this card's activation, it remains on the field, but destroy it during the End Phase of your opponent's 3rd turn. When this card is activated: If your opponent controls a face-down monster, flip all monsters they control face-up. While this card is face-up on the field, your opponent's monsters cannot declare an attack.