During your upkeep, activate Nim Devourer by paying {B}{B}, 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}{B}.
Repeat.

Infinite LTB

Infinite ETB

Infinite sacrifice triggers

Infinite death triggers

Nim Devourer

Pitiless Plunderer

Xorn

During your upkeep, activate Nim Devourer by paying {B}{B}, returning it from your graveyard to the battlefield, and then sacrificing it.
When Nim Devourer dies, Pitiless Plunderer triggers twice, creating two Treasure tokens.
Activate the Treasures by tapping and sacrificing them, adding {B}{B}.
Repeat.

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