Lucifer, the Morning Star

When Lucifer, the Morning Star enters the battlefield, gain control of target creature. Untap that creature. It gains haste until end of turn.

{r}{u}{b}{1}Gain control of target creature. Untap that creature. It gains haste until end of turn.

When Lucifer, the Morning Star would leave the battlefield exile him and all creatures you gained control of using Lucifer, the Morning Star. Return this creature to the battlefield transformed under your control.