Requires

Mortuary must be on the battlefield. Narcomoeba must be on the battlefield. Sanguine Spy must be on the battlefield. Pitiless Plunderer must be on the battlefield. Mana needed:

Steps

1. Activate Sanguine Spy by paying and sacrificing Narcomoeba.
2. When Narcomoeba dies, Mortuary and Pitiless Plunderer trigger.
3. Resolve the Mortuary trigger, putting Narcomoeba on top of your library from your graveyard.
4. Resolve the Pitiless Plunderer trigger, creating a Treasure token.
5. Resolve the Sanguine Spy ability, causing you to put Narcomoeba into your graveyard from the top of your library.
6. Narcomoeba triggers, returning itself to the battlefield from your graveyard.
7. Activate the Treasure by tapping and sacrificing it, adding .
8. Repeat.

Results