Dominion Saboteur + Phantom Train

Dominion Saboteur

Phantom Train

How it works

1. Activate Phantom Train by sacrificing Dominion Saboteur.
2. When Dominion Saboteur dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it. Choose to have it enter as a copy of the creature with persist with a +1/+1 counter on it.
3. Remove a +1/+1 counter and a -1/-1 counter from Dominion Saboteur as a state-based action.
4. Resolve the Phantom Train ability.
5. Repeat.