Müdøo-Ra, Goddess of Fear

Fear
{x},{t}: Tap target creature with manna value {x}, as long as Mudoo-Ra is on the battlefield,
target creature does not untap during its owners
untap step. Mudoo-Ra has power and toughness
of any one tapped creature an opponent controls.
Whenever Mudoo-Ra becomes the target of a
spell or ability, it phases out.