Ur'Gath's Temple of Oxy'z

{3}, {t}: Tap target creature you control.
Target player loses life equal to half,
rounded up, the power of the tapped creature.
When Ur'Gath's Temple of Oxy'z leaves
the battlefield, you may sacrifice a creature.
If you do, return Ur'Gath's Temple of
Oxy'z to your hand.