Narcomoeba + Mortuary + Selhoff Occultist + Phyrexian Altar

Narcomoeba

Mortuary

Selhoff Occultist

Phyrexian Altar

How it works

1. Activate Phyrexian Altar by sacrificing Narcomoeba, adding one mana of any color.
2. When Narcomoeba dies, Selhoff Occultist and Mortuary trigger.
3. Resolve the Mortuary trigger, putting Narcomoeba from your graveyard on top of your library.
4. Resolve the Selhoff Occultist trigger, causing you to mill Narcomoeba from the top of your library.
5. Narcomoeba triggers, putting it from your graveyard onto the battlefield.
6. Repeat.

This ingenious loop turns a simple sacrifice outlet into a self-sustaining engine by exploiting the interaction between the top of your library and the graveyard. When you sacrifice Narcomoeba to Phyrexian Altar, Mortuary immediately catches the creature to return it right back to the top of your library. At the same time, Selhoff Occultist watches the creature die and mills that exact card away, triggering Narcomoeba's own ability to slide effortlessly back onto the battlefield.