You can only use the 1st and 2nd effect of this card’s name each once per turn.
(1) If your opponent controls a card: Set 1 “Ninjitsu Art” Spell/Trap and/or 1 “Ninja” monster (1 from your Deck and 1 from your GY), except “Ninjitsu Art Notebook of Mystery”.
(2) If this Set card is sent to the GY: You can target 1 face-up monster on the field; change it to face-down Defense Position.