The Phantom Knights of Cursed Javelin

2 Level 2 monstersYou can detach 1 material from this card, then target 1 face-up monster your opponent controls; until the end of this turn, change its ATK to 0, also negate its effects. This is a Quick Effect if this card has a "The Phantom Knights" card as material. You can only use this effect of "The Phantom Knights of Cursed Javelin" once per turn.