Emeria Shepherd + World Shaper + Yahenni, Undying Partisan + Trenching Steed

Emeria Shepherd

World Shaper

Yahenni, Undying Partisan

Trenching Steed

How it works

1. Activate Trenching Steed by sacrificing a land.
2. Repeat step 1 until you control no lands.
3. Activate Yahenni 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 Yahenni ability.
9. Repeat

This loop turns a seemingly innocuous land-sacrificing engine into a devastating recursion engine by letting you repeatedly flood the battlefield with land drops. Trenching Steed acts as the outlet to clear away your lands, feeding them directly into the graveyard so World Shaper can scoop them all back up when it is sacrificed to Yahenni, Undying Partisan. As those lands flood back in—especially Plains—Emeria Shepherd's landfall ability triggers en masse, letting you pull World Shaper and every other nonland permanent straight from your graveyard back onto the battlefield. Yahenni, Undying Partisan safely protects your key creature through the cycle while ensuring all these overlapping triggers cleanly reset the loop for infinite value.