Spawning Pit + Faceless Butcher + Karmic Guide

Spawning Pit

Faceless Butcher

Karmic Guide

How it works

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