Na'Lux Head Cultist

Nu'lux has hexproof while tapped.
{2}{w/b}{w/b}{w/b}{w/b}{t}: Sacrifice a creature. Gain control of target creature an opponent controls that shares a creature type with the sacrificed creature. You may activate this ability once during your precombat phase.
If "Nu'lux Head Cultist"would leave the battlefield return all creatures taken by Nu'lux to their owners.