Deserter's Quarters

Oracle Text

You may choose not to untap Deserter's Quarters during your untap step.

6, T: Tap target creature. It doesn't untap during its controller's untap step for as long as Deserter's Quarters remains tapped.

Card Rulings

4/26/2014 The activated ability can target any creature, not just one that’s untapped.
4/26/2014 As long as Deserter’s Quarters remains tapped, the effect stopping the creature from untapping during its controller’s untap step remains even if that creature untaps some other way (for example, with Colossal Heroics).