Ygra, Eater of All + Camellia, the Seedmiser + Phantom Train

Ygra, Eater of All

Camellia, the Seedmiser

Phantom Train

How it works

1. Activate Phantom Train by sacrificing any other creature.
2. Because the creature is a Food due to Ygra, when it dies, Camellia and Ygra trigger.
3. Resolve the Ygra trigger, putting two +1/+1 counters on it.
4. Resolve the Camellia trigger, creating a 1/1 Squirrel creature token.
5. Resolve the Phantom Train ability
6. Repeat.

This gruesome feedback loop turns the locomotive relentless by relying entirely on Ygra, Eater of All to cast a wide net: because Ygra turns every other creature on your board into a Food artifact, you can feed them directly into Phantom Train's activation cost. Every time you sacrifice a creature to pump Phantom Train and animate it into a Spirit artifact creature, Ygra's constant presence ensures that death counts as a Food hitting the graveyard, triggering a massive +1/+1 counter reward for Ygra itself. Meanwhile, that exact same sacrifice satisfies Camellia, the Seedmiser's hunger, letting you continuously spawn fresh 1/1 green Squirrel creature tokens to keep the engine fueled.