Perigee Beckoner + Metamorphosis Fanatic + Phantom Train

Perigee Beckoner

Metamorphosis Fanatic

Phantom Train

How it works

1. Cast Perigee Beckoner for its warp cost by paying 1.
2. When Perigee Beckoner enters, it triggers, targeting Metamorphosis Fanatic.
3. Activate Phantom Train by sacrificing Perigee Beckoner.
4. Activate Phantom Train by sacrificing Metamorphosis Fanatic.
5. When Metamorphosis Fanatic dies, it triggers, returning itself from your graveyard to the battlefield tapped.
6. When Metamorphosis Fanatic enters, it triggers, returning Perigee Beckoner from your graveyard to the battlefield.
7. When Perigee Beckoner enters, it triggers, targeting Metamorphosis Fanatic.
8. Resolve the Phantom Train ability from step 4.
9. Repeat from step 3.

This clever loop sets up an infinite recursion of life and death by exploiting how Phantom Train can repeatedly sacrifice your creatures to fuel its own animation and growth. The trick relies on Metamorphosis Fanatic bringing back Perigee Beckoner from the graveyard when it enters, while Perigee Beckoner's entry trigger grants the necessary return-upon-death effect back to Metamorphosis Fanatic. Because Phantom Train accepts these alternating sacrifices to place +1/+1 counters upon itself, you can cycle these two entities through the graveyard indefinitely to generate unbounded sacrifice and enter-the-battlefield triggers.