Callous Oppressor [Onslaught]

Set: Onslaught Type: Creature — Cephalid Rare Cost: {1}{U}{U} You may choose not to untap Callous Oppressor during your untap step. As Callous Oppressor enters the battlefield, an opponent chooses a creature type. {T}: Gain control of target creature that isn't of the chosen type for as long as Callous Oppressor remains tapped.