Necrotic Processor

Necrotic Processor enters the battlefield with 3
charge counters on it.
Sacrifice a creature: Put X charge counters on
Necrotic Processor, where X is the mana value
of the sacrificed creature.
Remove X charge counters from Necrotic
Processor: Create an X/X ivory knight creature
token with first strike and vigilance.
People worry, fear and doubt. The dead, however,
have no such qualms.