Szarel, Genesis Shepherd + Crystalline Crawler + Cult Conscript + Phantom Train

Szarel, Genesis Shepherd

Crystalline Crawler

Cult Conscript

Phantom Train

How it works

1. Activate Cult Conscript by paying 1, returning it from your graveyard to the battlefield.
2. Activate Phantom Train by sacrificing Cult Conscript.
3. When Cult Conscript is sacrificed, Szarel triggers, putting a number of +1/+1 counters equal to Szarel's power on Crystalline Crawler.
4. Resolve the Phantom Train ability.
5. Activate Crystalline Crawler twice by removing two +1/+1 counters from it, adding 1.
6. Repeat.

This clever loop turns the graveyard into a revolving door of sacrifices, fueled entirely by the interplay between Szarel, Genesis Shepherd and Crystalline Crawler. You use Crystalline Crawler's ability to strip away its own +1/+1 counters for mana, which pays to continuously recur Cult Conscript from your graveyard using its own activation cost. Each time Cult Conscript is sacrificed to Phantom Train's ability, Szarel, Genesis Shepherd triggers to dump a massive pile of +1/+1 counters straight back onto Crystalline Crawler, netting you extra mana and growing your creatures into unstoppable titans.