Pitiless Plunderer + Eternal Witness + Mitotic Slime + Nethroi, Apex of Death + Bloodflow Connoisseur

Pitiless Plunderer

Eternal Witness

Mitotic Slime

Nethroi, Apex of Death

Bloodflow Connoisseur

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 Bloodflow Connoisseur by sacrificing Nethroi.
4. When Nethroi dies, Pitiless Plunderer triggers, creating a Treasure artifact token.
5. Resolve the Bloodflow Connoisseur ability, putting a +1/+1 counter on it.
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 Bloodflow Connoisseur 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 Bloodflow Connoisseur abilities, putting two +1/+1 counters on it.
13. Activate Bloodflow Connoisseur 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 Bloodflow Connoisseur abilities, putting two +1/+1 counters on it.
18. Activate Bloodflow Connoisseur twice by sacrificing two Oozes.
19. When the Oozes die, Pitiless Plunderer triggers twice, creating two Treasure artifact tokens.
20. Resolve both Bloodflow Connoisseur abilities, putting two +1/+1 counters on it.
21. Activate the seven Treasures by tapping and sacrificing them, adding 4G/W.
22. Repeat.

This intricate loop uses Nethroi, Apex of Death's explosive mutate trigger to pull Eternal Witness and Mitotic Slime straight from your graveyard, immediately feeding them to Bloodflow Connoisseur to kick off a chain reaction. As your creatures perish, Pitiless Plunderer quietly converts every single death into precious Treasure tokens to fund your next iteration. Meanwhile, Eternal Witness recycles Nethroi right back to your hand, and Mitotic Slime's nested Ooze tokens ensure you always have enough sacrificial fodder to keep the engine roaring and grow your Bloodflow Connoisseur infinitely.