Pitiless Plunderer and Anointed Procession on the battlefield.
({B} magic symbol) ({B} magic symbol) available.
Steps
During your upkeep, activate Nim Devourer by paying ({B} magic symbol) ({B} magic symbol) , returning it from your graveyard to the battlefield, and then sacrificing it.
When Nim Devourer dies, Pitiless Plunderer triggers, creating two Treasure tokens.
Activate the Treasures by tapping and sacrificing them, adding ({B} magic symbol) ({B} magic symbol) .