Magewright's Stone

• WWizards of the Coast2006-05-01
  Official Ruling
  This looks for the symbol. The phrase “tap an untapped creature you control” isn’t the same and doesn’t count.
• WWizards of the Coast2006-05-01
  Official Ruling
  If an activated ability with in its cost is granted to a creature by an effect (such as Hypervolt Grasp’s effect, for instance), Magewright’s Stone can untap that creature.

Rulings via Scryfall