Emeria Shepherd + World Shaper + Coastal Hornclaw + Phantom Train

Emeria Shepherd

World Shaper

Coastal Hornclaw

Phantom Train

How it works

1. Activate Coastal Hornclaw by sacrificing a land.
2. Repeat step 1 until you control no lands.
3. Activate Phantom Train by sacrificing World Shaper.
4. When World Shaper dies, it triggers, return all lands from your graveyard to the battlefield tapped.
5. When the lands enter, Emeria Shepherd triggers that many times.
6. Resolve an Emeria Shepherd trigger that was triggered by a Plains, returning World Shaper from your graveyard to the battlefield.
7. Resolve all remaining Emeria Shepherd triggers.
8. Resolve the Phantom Train ability.
9. Repeat

This clever loop transforms a pile of disparate permanents into an infinite recursion engine fueled by land sacrifice and graveyard returns. By using Coastal Hornclaw to strip away your lands, you set the stage to sacrifice World Shaper to Phantom Train, triggering World Shaper's death ability to flood the battlefield with every land currently in your graveyard. Those lands instantly feed Emeria Shepherd's landfall ability, which not only brings World Shaper right back to hand or battlefield to start the cycle anew, but also lets you recur any other nonland permanent you desire.