Jetmir, Nexus of Revels + Skittering Precursor + Sword of the Meek + Phantom Train

Jetmir, Nexus of Revels

Skittering Precursor

Sword of the Meek

Phantom Train

How it works

1. Activate Phantom Train by sacrificing Sword of the Meek.
2. Skittering Precursor triggers, creating a 0/1 Eldrazi Spawn creature token.
3. When the Eldrazi Spawn enters the battlefield as a 1/1 due to Jetmir, Sword of the Meek triggers, returning Sword of the Meek from your graveyard to the battlefield attached to the Eldrazi Spawn.
4. Resolve the Phantom Train ability
5. Activate the Eldrazi Spawn by sacrificing it, adding C.
6. Repeat.

This loop transforms a modest sacrifice engine into a runaway engine of growth and resource generation. Phantom Train sets the stage by letting you sacrifice Sword of the Meek, which in turn triggers Skittering Precursor to churn out an Eldrazi Spawn. Because Jetmir, Nexus of Revels pumps your team based on your creature count, that newly minted token enters as a 1/1, neatly satisfying the condition needed to pull Sword of the Meek right back out of the graveyard and attach it. You can then sacrifice the Eldrazi Spawn for colorless mana to keep the gears turning, leaving Phantom Train larger with every single iteration.