Requires

Pitiless Plunderer must be on the battlefield. Eternal Witness must be in the graveyard. Mitotic Slime must be in the graveyard. Nethroi, Apex of Death must be in hand, or in the command zone. Viscera Seer must be on the battlefield. Mana needed: plus enough mana to pay for commander tax, if applicable

Steps

1. Cast Nethroi either from your hand or from the command zone for its mutate cost by paying plus commander tax, if applicable, putting it on top of a non-Human creature you control.
2. When Nethroi enters the battlefield, it triggers.
3. Holding priority, activate Viscera Seer by sacrificing Nethroi.
4. When Nethroi dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
5. Resolve the Viscera Seer ability, causing you to scry 1.
6. Resolve the Nethroi trigger from step 2, returning Eternal Witness and Mitotic Slime from your graveyard to the battlefield.
7. When Eternal Witness enters the battlefield, it triggers, returning Nethroi from your graveyard to your hand.
8. Activate Viscera Seer twice by sacrificing Eternal Witness and Mitotic Slime.
9. When Eternal Witness and Mitotic Slime die, Pitiless Plunderer triggers twice and Mitotic Slime triggers once.
10. Resolve both Pitiless Plunderer triggers, creating two Treasure artifact tokens.
11. Resolve the Mitotic Slime trigger, creating two 2/2 Ooze creature tokens.
12. Resolve both Viscera Seer abilities, causing you to scry 1 twice.
13. Activate Viscera Seer twice by sacrificing two Oozes.
14. When the Oozes die, they each trigger and Pitiless Plunderer triggers twice.
15. Resolve both Pitiless Plunderer triggers, creating two Treasure artifact tokens.
16. Resolve both Ooze triggers, creating four 1/1 Ooze creature tokens.
17. Resolve both Viscera Seer abilities, causing you to scry 1 twice.
18. Activate Viscera Seer twice by sacrificing two Oozes.
19. When the Oozes die, Pitiless Plunderer triggers twice, creating two Treasure artifact tokens.
20. Resolve both Viscera Seer abilities, causing you to scry 1 twice.
21. Activate the seven Treasures by tapping and sacrificing them, adding .
22. Repeat.

Results