Emeria Shepherd + World Shaper + Viscera Seer + Lithatog

Emeria Shepherd

World Shaper

Viscera Seer

Lithatog

How it works

1. Activate Lithatog by sacrificing a land.
2. Repeat step 1 until you control no lands.
3. Activate Viscera Seer 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 Viscera Seer ability.
9. Repeat

This clever loop transforms Lithatog's land-sacrificing ability into a complete engine by using Viscera Seer to send World Shaper to the graveyard, where its death trigger brings all those sacrificed lands right back to the battlefield tapped. That massive wave of land drops awakens Emeria Shepherd, whose landfall ability takes full advantage of your Plains entering the battlefield to immediately return World Shaper straight to the battlefield, ready to be sacrificed all over again.