Once per turn, during either player's turn: You can discard 1 "Ninja" monster and 1 "Ninjitsu Art" card to target 1 face-up monster your opponent controls; this turn, that monster's effects are negated, also that monster cannot attack.
you're an idiot...this can prevent a gozuki or il blud or wyvern, warm worm...etc from activating their effect since the ninja effect can activate during either players turn. just be quiet before making stupid comments
Holy shit, some of you guys are retarded. This can't negate Warm Worm or Wyvern, since they activate on graveyard. And even if it could, why the guck wouldn't you play Ultimate Providence that just needs a discard? I guess it's a compliment: to be hated by retards that don't even understand the game.