Emeria Shepherd + World Shaper + Blasting Station + Troubled Healer

Emeria Shepherd

World Shaper

Blasting Station

Troubled Healer

How it works

1. Activate Troubled Healer by sacrificing a land.
2. Repeat step 1 until you control no lands.
3. Activate Blasting Station by tapping it and 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. When World Shaper enters, Blasting Station triggers, untapping Blasting Station.
8. Resolve all remaining Emeria Shepherd triggers.
9. Resolve the Blasting Station ability from step 3.
10. Repeat

This intricate loop lets you sacrifice your lands away to Troubled Healer's activation, stocking your graveyard alongside the World Shaper you sacrificed to Blasting Station. When World Shaper's death trigger resolves, it floods the battlefield with all those lands at once, triggering Emeria Shepherd's landfall ability multiple times. Because those returning lands include Plains, Emeria Shepherd's replacement effect allows you to instantly return World Shaper straight to the battlefield instead of your hand, which in turn untaps Blasting Station to start the slaughter all over again.