Akeman, Deva of Violation

As an additional cost to cast Akeman, Deva of Violation, show your hand to your opponent, pay
5 life and sacrifice a creature.
Reach, indestructible, lifelink.
{b/r}{4}: your opponent shows his or her hand; or take control of target creature until the end of the turn, untap it, it gains haste until the end of the turn.