Corrosive Scales (LED2-EN010) - Legendary Duelists: Ancient Millennium 1st Edition

Target 1 Insect monster you control; equip this card to it. Your opponent's monsters cannot attack Insect monsters, except the equipped monster you control. Each time your opponent Normal or Special Summons a monster(s), or their activated card or effect resolves, place 1 Scale Counter on each face-up monster your opponent controls. Each monster your opponent controls loses 100 ATK/DEF for each Scale Counter on it.