Vortex of Skulls

At the beginning of the end step, exile
Vortex of Skulls. Activate each of its abilities
only once.
{b}: Target player loses three life. You gain life
equal to the life lost this way.
{b}{b}{b}: Return target permanent card in your graveyard to the battlefield tapped.
{1}{b}: Destroy target permanent
{2}{b}: Whenever a creature dies this turn, each opponent loses two life.