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Modern Text:

This text is from the most recent printing of the card. It may not apply to Edison Format!

After this card's activation, it remains on the field, but you must 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 can't declare an attack.