The Blackstaff of Waterdeep (Promo Pack) [Dungeons & Dragons: Adventures in the Forgotten Realms Promos]

You may choose not to untap The Blackstaff of Waterdeep during your untap step.
Animate Walking Statue — {1}{U}, {T}: 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.