Mega Greninja ex Flips the Battle Upside Down! Deliver serious damage and take Mega Greninja ex for a spin! Its Mortal Shuriken Ability lets you discard a Basic Water Energy from your hand to place six damage counters on one of your opponent’s Pokémon. Then, finish up your turn with its Ninja Spinner attack—which has the potential to do 200 damage! In this collection, you’ll get a foil promo card…