Prowling Geistcatcher + Kiki-Jiki, Mirror Breaker + Carrion Feeder

Prowling Geistcatcher

Kiki-Jiki, Mirror Breaker

Carrion Feeder

How it works

1. Activate Kiki-Jiki by tapping it, creating a token copy of Prowling Geistcatcher with haste.
2. Activate Carrion Feeder by sacrificing Kiki-Jiki.
3. When Kiki-Jiki dies, the nontoken and token Prowling Geistcatcher's first abilities trigger.
4. Resolve the token Prowling Geistcatcher's trigger, exiling Kiki-Jiki from your graveyard.
5. Resolve the nontoken Prowling Geistcatcher's trigger, doing nothing.
6. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
7. Activate Carrion Feeder by sacrificing the Prowling Geistcatcher token.
8. When the token Prowling Geistcatcher dies, its second ability and the nontoken Prowling Geistcatcher's first ability triggers.
9. Resolve the nontoken Prowling Geistcatcher trigger, putting a +1/+1 counter on it.
10. Resolve the token Prowling Geistcatcher trigger, returning Kiki-Jiki from exile to the battlefield.
11. Resolve the Carrion Feeder ability, putting a +1/+1 counter on it.
12. Repeat.

This loop transforms Kiki-Jiki, Mirror Breaker and Carrion Feeder into a self-sustaining sacrifice engine by taking advantage of a token copy of Prowling Geistcatcher. When Kiki-Jiki is fed to Carrion Feeder, the original Prowling Geistcatcher and its token double both trigger to safely stash Kiki-Jiki away in exile rather than letting it stay in the graveyard. Sacrificing that Prowling Geistcatcher token then immediately triggers its leave-the-battlefield ability, bringing Kiki-Jiki right back to the battlefield so the entire process can begin anew.