Pitiless Plunderer + Eternal Witness + Mitotic Slime + Nethroi, Apex of Death + Yahenni, Undying Partisan

Pitiless Plunderer

Eternal Witness

Mitotic Slime

Nethroi, Apex of Death

Yahenni, Undying Partisan

How it works

1. Cast Nethroi either from your hand or from the command zone for its mutate cost by paying 4G/W 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 Yahenni by sacrificing Nethroi.
4. When Nethroi dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
5. Resolve the Yahenni ability, giving it indestructible until end of turn.
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 Yahenni 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 Yahenni abilities, giving it indestructible until end of turn.
13. Activate Yahenni 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 Yahenni abilities, giving it indestructible until end of turn.
18. Activate Yahenni twice by sacrificing two Oozes.
19. When the Oozes die, Pitiless Plunderer triggers twice, creating two Treasure artifact tokens.
20. Resolve both Yahenni abilities, giving it indestructible until end of turn.
21. Activate the seven Treasures by tapping and sacrificing them, adding 4G/W.
22. Repeat.