Fia, Deathbed Companion

Zombies you control get +1/+1 and lifelink.
{3}{w/b}{w/b}{t},Sacrifice Fia: Return any number of creature cards
from your graveyard to the battlefield tapped.
If you do, lose life equal to the total mana value of
those creatures.
What greater blessing could there be, but to be born a Deathbed Companion?