Phyrexian Conscription

Whenever a creature dies, you may pay {p/b}{p/b}. If
you do, return that creature to the battlefield
under your control. It becomes a black Phyrexian in addition to its other types and colors.
Phyrexians you control get +1/+1.
Sacrifice a Phyrexian: Target opponent loses 1
life and you gain 1 life. Activate this ability only
once per turn.