Iron Maiden of the Ruins

Iron Maiden of the Ruins enters the battlefield with X spike counters on it.
You may choose not to untap Iron Maiden of the Ruins during your untap step.
{5},{t}: Tap target creature with converted mana cost X or less, where X is the numbers of spike counters on Iron Maiden of the Ruins. It does not untap while Iron Maiden of the Ruins remains tapped.