Amazoness Archers (SGX3-END16) - Speed Duel GX: Duelists of Shadows 1st Edition

Activate only when your opponent declares an attack while you control an "Amazoness" monster. All monsters your opponent controls are changed to face-up Attack Position (Flip Effects are not activated), and lose 500 ATK as long as they remain face-up on the field. Your opponent must attack with all of their monsters.