Armor Ninjitsu Art of Freezing [ORCS-EN068] Common

When an opponent's monster declares an attack, if you control a face-up "Ninja" monster: You can flip this card face-up; negate that attack and end the Battle Phase. Once this card is face-up on the field, monsters your opponent controls cannot change their Battle Positions while you control a face-up "Ninja" monster(s).