Dinomist Plesios (MP16-EN194) - 2016 Mega-Tins Mega Pack Unlimited

Pendulum Effect : Once, while this card is in your Pendulum Zone, you can negate an activated card effect that targets another "Dinomist" card(s) you control, then destroy this card.
Monster Effect : All face-up monsters your opponent controls lose 100 ATK and DEF for each "Dinomist" card you control.