Nethroi, Apex of Death + Phyrexian Altar + Mitotic Slime + Stonecloaker

Nethroi, Apex of Death

Phyrexian Altar

Mitotic Slime

Stonecloaker

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 Stonecloaker and Mitotic Slime from your graveyard to the battlefield.
3. When Stonecloaker enters, it triggers, returning Nethroi from the battlefield to your hand.
4. Activate Phyrexian Altar twice by sacrificing Stonecloaker 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 turns the recursion power of Nethroi, Apex of Death into an infinite engine by leveraging Phyrexian Altar to churn through bodies. When Nethroi mutates onto a creature, its trigger pulls both Mitotic Slime and Stonecloaker out of your graveyard. Stonecloaker immediately bounces Nethroi back to your hand so you can repeat the cast, while Mitotic Slime and the resulting cascade of Ooze tokens are fed directly into Phyrexian Altar to generate an endless supply of colored mana and sacrifices.