Shizo, Envoy of Death

Bushido 2
When Shizo, Envoy of Death deals combat damage to an opponent, add that many soul counters to Shizo, Envoy of Death.
You may remove all Soul Counters from Shizo, Envoy of Death and add {b} to your mana pool for each counter removed this way. Spend this mana only to cast creature spells from your graveyard.