Sister Hospitaller + Thermopod + Faceless Butcher

Sister Hospitaller

Thermopod

Faceless Butcher

How it works

1. Cast Faceless Butcher by paying its mana cost.
2. When Faceless Butcher enters, its first ability triggers, exiling Sister Hospitaller.
3. Activate Thermopod by sacrificing Faceless Butcher.
4. When Faceless Butcher dies, its second ability triggers, returning Sister Hospitaller from exile to the battlefield.
5. When Sister Hospitaller enters, it triggers, returning Faceless Butcher from your graveyard to the battlefield.
6. When Faceless Butcher enters, its first ability triggers, exiling Sister Hospitaller.
7. Repeat from step 3.

This loop is driven by a clever exchange of entering and leaving the battlefield between Faceless Butcher and Sister Hospitaller. When Faceless Butcher enters to exile Sister Hospitaller, Thermopod steps in to sacrifice the Butcher, triggering its death ability to return Sister Hospitaller to the battlefield. The returning Sister Hospitaller immediately brings Faceless Butcher back from the graveyard, renewing the exile trigger and allowing you to loop the process indefinitely while generating infinite red mana through Thermopod's sacrifice ability alongside endless life and creature triggers.