Emeria Shepherd + World Shaper + Overgrown Estate + Yahenni, Undying Partisan

Emeria Shepherd

World Shaper

Overgrown Estate

Yahenni, Undying Partisan

How it works

1. Activate Overgrown Estate 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 simple graveyard cycle into an infinite engine, anchored by Emeria Shepherd ensuring that every land dropped as a Plains brings back both World Shaper and any other permanent you desire directly to the battlefield. You fuel this engine using Overgrown Estate to sacrifice away your lands for life, which immediately sets up World Shaper to be sacrificed to Yahenni, Undying Partisan. When World Shaper bites the dust, its death trigger sweeps every land from your graveyard back onto the battlefield tapped, triggering Emeria Shepherd's landfall ability en masse to recur everything you need while growing Yahenni into an unstoppable threat.