Emeria Shepherd + World Shaper + Thaumatog + Yahenni, Undying Partisan

Emeria Shepherd

World Shaper

Thaumatog

Yahenni, Undying Partisan

How it works

1. Activate Thaumatog 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 intricate loop turns the graveyard into your personal workshop, letting you endlessly recycle your entire land and nonland arsenal. It all starts by letting Thaumatog devour your lands to strip your board clean, opening the door to sacrifice World Shaper to Yahenni, Undying Partisan. When World Shaper perishes, its death trigger sweeps every land back onto the battlefield all at once. That sudden influx of real estate triggers Emeria Shepherd over and over, allowing you to bypass your hand entirely and slam World Shaper (and any other nonland permanent you desire) straight back to the battlefield when a Plains joins the party.