Grip of the Roil

Grip of the Roil can target a creature that's already tapped. It still won't untap during its controller's next untap step.

If an instant or sorcery spell cast for its surge cost is copied, the copy is also considered to have had its surge cost paid.

Grip of the Roil tracks the creature, but not its controller. If the creature changes controllers before its first controller's next untap step has come around, then it won't untap during its new controller's next untap step.