Nethroi, Apex of Death + Phyrexian Altar + Mitotic Slime + Kor Skyfisher

Nethroi, Apex of Death

Phyrexian Altar

Mitotic Slime

Kor Skyfisher

How it works

1. Cast Nethroi either from your hand or from the command zone for its mutate cost by paying 4G/W, putting it under a non-Human creature you control.
2. Nethroi triggers, returning Kor Skyfisher and Mitotic Slime from your graveyard to the battlefield.
3. When Kor Skyfisher enters, it triggers, returning Nethroi from the battlefield to your hand.
4. Activate Phyrexian Altar twice by sacrificing Kor Skyfisher and Mitotic Slime, adding .
5. When Mitotic Slime dies, it triggers, creating two 2/2 Ooze creature tokens.
6. Activate Phyrexian Altar twice by sacrificing the Oozes, adding 1G/W.
7. When the Oozes die, they trigger, creating four 1/1 Ooze creature tokens.
8. Activate Phyrexian Altar three times by sacrificing three Oozes, adding 3.
9. Repeat.

This loop relies on Nethroi, Apex of Death to pull Mitotic Slime and Kor Skyfisher straight from your graveyard the moment it enters the battlefield via mutate. Once they arrive, Phyrexian Altar provides the sacrifice outlet needed to generate a steady stream of mana while feeding the graveyard. As Mitotic Slime perishes, its cascading Ooze tokens step in to fuel even more sacrifices through Phyrexian Altar's mana-generating ability. Finally, Kor Skyfisher's entry trigger bounces Nethroi back to your hand, allowing you to recast and mutate it all over again in an endless, mana-positive cycle.