Olivia, Mobilized for War + Grim Haruspex + Phantom Train

Olivia, Mobilized for War

Grim Haruspex

Phantom Train

How it works

1. Activate Phantom Train by sacrificing the persist creature.
2. When the persist creature dies, it and Grim Haruspex trigger.
3. Resolve the Grim Haruspex trigger, causing you to draw a card.
4. Resolve the persist creature's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
5. When the persist creature enters the battlefield, Olivia triggers, putting a +1/+1 counter on the persist creature and causing you to discard a card.
6. Resolve the Phantom Train ability.
7. Repeat.

This intricate engine centers on Phantom Train using its ability to repeatedly sacrifice a creature with persist, whose own ability brings it right back from the graveyard. As that creature re-enters the battlefield, Olivia, Mobilized for War triggers to discard a card and place a +1/+1 counter on it, which immediately neutralizes the incoming -1/-1 counter through state-based actions so the loop can continue indefinitely. Meanwhile, Grim Haruspex watches the relentless cycle of sacrifices, translating every trip to the graveyard into a steady stream of drawn cards.