Your search for "Mask of Weakness DT01-EN047" revealed the following:
Mask of Weakness - DT01-EN047 - Duel Terminal Normal Parallel Rare from Duel Terminal 1, available at 401 Games Canada. Rarity: Duel Terminal Normal Parallel Rare Card Text:Target 1 attacking monster; that target loses 700 ATK until the End Phase....
Mask of Weakness - DTP1-EN017 - Duel Terminal Normal Parallel Rare from Duel Terminal - Preview, available at 401 Games Canada. Rarity: Duel Terminal Normal Parallel Rare Card Text:Target 1 attacking monster; that target loses 700 ATK until the End...