You may choose not to untap The Blackstaff of Waterdeep during your untap step. Animate Walking Statue β , : Another target nontoken artifact you control becomes a 4/4 artifact creature for as long as The Blackstaff of Waterdeep remains tapped. Activate only as a sorcery.
The Blackstaff of Waterdeep (AFR-365) - Adventures in the Forgotten Realms: (Extended Art) Foil