Performapal Seal Eel (MP17-EN129)

Pendulum Effect : Once per turn: You can target 1 face-up monster your opponent controls; that face-up monster has its effects negated until the end of this turn (even if this card leaves the field).

Monster Effect : When this card is Normal or Special Summoned: You can target 1 Set Spell/Trap Card your opponent controls; that Set card cannot be activated this turn. Neither player can activate cards or effects in response to this effect's activation.