Enmu

Annihilator 1 (Whenever this creature attacks,
defending player sacrifices a permanent.)

{2}{u}{u}, {t}: Tap target creature an opponent
controls and put a stun counter on it. (If a
permanent with a stun counter would become
untapped, remove one from it instead.)

{2}{b}{b}, {t}: Gain control of target creature for
as long as you control Enmu.