Nargacuga, Pouncing Night

Flash, First Strike
Agility {2} (Creatures with Agility have "If this creature becomes the target of a spell or ability an opponent controls, you may pay {2}. If you do, tap this creature and counter that spell or ability.")
When Nargacuga, Pouncing Night enters the battlefield, if it's not your turn, destroy target creature with power less than Nargacuga, Pouncing Night.