Nethroi, Apex of Death + Phyrexian Altar + Mitotic Slime + Stickytongue Sentinel

Nethroi, Apex of Death

Phyrexian Altar

Mitotic Slime

Stickytongue Sentinel

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 Stickytongue Sentinel and Mitotic Slime from your graveyard to the battlefield.
3. When Stickytongue Sentinel enters, it triggers, returning Nethroi from the battlefield to your hand.
4. Activate Phyrexian Altar twice by sacrificing Stickytongue Sentinel 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 ingenious loop turns Nethroi, Apex of Death into a mass-reanimation engine that continually cycles back to your hand through the clever bounce of Stickytongue Sentinel. Every time Nethroi mutates onto the battlefield, it dredges up the Sentinel and Mitotic Slime from your graveyard, providing a cascade of fodder for Phyrexian Altar to sacrifice along with the Ooze tokens they naturally leave behind. This sacrifice process not only fully refunds and multiplies your mana to recast Nethroi's mutate cost, but also ensures the Sentinel is ready to bounce Nethroi right back to your hand for the next iteration.