Cayth, Famed Mechanist + Phantom Train

Cayth, Famed Mechanist

Phantom Train

How it works

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