Svagra, Oracle of Blood

Eminence --- Whenever you put one or more -1/-1 counters on a creature, if Svagra, Oracle of Blood
is in the command zone or on the battlefield,
create a 0/1 Black Leech creature token.
Creature tokens you control get +1/+0 and have
Wither
{b}{r}{g}, Sacrifice X creatures, {t}: Draw X cards.