MP23-EN201 * Ninjitsu Art Notebook of Mystery * Common * 25th Anniversary Tin: Dueling Heroes Mega PackIf your opponent controls a card: You can Set up to 1 "Ninja" monster, and up to 1 "Ninjitsu Art" Spell Trap, except "Ninjitsu Art Notebook of Mystery". These cards come from your Deck and or GY, but only 1 can come from each. If this Set card on the field is sent to the GY: You can target 1 face up monster on the field; change it to face down Defense Position. You can only use each effect of "Ninjitsu Art Notebook of Mystery" once per turn.