The Hollow Knight

You can choose not to untap The Hollow Knight
during your untap step.
{x}{w}{t} - As an additional cost to this ability,
tap another creature you control. As long as The
Hollow Knight remains tapped, target nonland
permanent opponent controls is under your
control. X is the mana cost of target permanent.
The old king of Hallownest... he must have been desperate to save his crumbling little world. The sacrifices he imposed on others... all for nothing.
-The Hunter