Voldaren Soulcaster

Whenever a nontoken creature you control dies, place a 1/1 black Spirit creature token onto the battlefield.
Whenever an opponent Investigates, you may sacrifice any number of Spirit creatures. If you do, Voldaren Soulcaster deals 1 damage to that opponent per Spirit sacrificed in this way.
Voldaren necromancers command spirits of freshly killed victims by savoring the blood spilled in their final moments.