Emeria Shepherd + Aftermath Analyst + Coastal Hornclaw + Horizon Explorer

Emeria Shepherd

Aftermath Analyst

Coastal Hornclaw

Horizon Explorer

How it works

1. Activate any number of lands by tapping them, adding at least 3.
2. Activate Coastal Hornclaw by sacrificing a land.
3. Repeat step 2 until you control no lands.
4. Activate Aftermath Analyst by paying 3 and sacrificing it, returning all lands from your graveyard to the battlefield untapped due to Horizon Explorer.
5. When the lands enter, Emeria Shepherd triggers that many times.
6. Resolve an Emeria Shepherd trigger that was triggered by a Plains, returning Aftermath Analyst from your graveyard to the battlefield.
7. Resolve all other Emeria Shepherd triggers, returning any number of nonland permanents from your graveyard to either your hand or the battlefield.
8. Repeat.

This ingenious self-sustaining loop relies on feeding your own lands to Coastal Hornclaw until your board is completely cleared of them. Once your graveyard is flush with lands, you crack Aftermath Analyst to haul them all back en masse, a process made instantaneously explosive thanks to Horizon Explorer ensuring those lands enter untapped. That massive wave of landfalls triggers Emeria Shepherd over and over; by making sure at least one of those returning lands is a Plains, you can pluck Aftermath Analyst right back out of the graveyard to do it all over again, while using the rest of the triggers to sweep your entire graveyard of nonland permanents directly onto the battlefield.