Number 16: Shock Master (Platinum Secret Rare) (RA04-EN166)

3 Level 4 monsters
Once per turn: You can detach 1 Xyz Material from this card to declare 1 card type (Monster, Spell, or Trap); that type of card (if Spell or Trap) cannot be activated, or (if Monster) cannot activate its effects, until the end of your opponent's next turn.