Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight + White Widow, Free Agent + Phantom Train

Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

White Widow, Free Agent

Phantom Train

How it works

1. Activate Phantom Train by sacrificing White Widow.
2. When White Widow dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
3. When White Widow enters, it triggers, putting a +1/+1 counter on it and up to one other creature.
4. Resolve the Phantom Train ability.
5. Repeat.

This engine transforms the battlefield into an endless cycle of sacrifice and resurrection, anchored by Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight granting its vital persist ability to your nontoken creatures once flipped. By feeding White Widow, Free Agent into Phantom Train, you trigger the creature's persist to bring it right back with a -1/+1 counter that immediately cancels out thanks to White Widow's own entry trigger. Because Phantom Train accepts any sacrificed creature or artifact while growing larger with every iteration, you can repeat this loop indefinitely to generate boundless creature entries, deaths, and counters.