Emeria Shepherd + World Shaper + Goblin Bombardment + Trenching Steed

Emeria Shepherd

World Shaper

Goblin Bombardment

Trenching Steed

How it works

1. Activate Trenching Steed by sacrificing a land.
2. Repeat step 1 until you control no lands.
3. Activate Goblin Bombardment 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 Goblin Bombardment ability.
9. Repeat

This clever loop turns the self-sacrificing nature of Trenching Steed into a catastrophic engine by stripping your board of lands to fuel Emeria Shepherd's landfall triggers. You use Goblin Bombardment to sacrifice World Shaper, whose death trigger floods the battlefield with all those dumped lands at once. Because those lands include Plains, Emeria Shepherd's ability snaps World Shaper right back from the graveyard to the battlefield, setting you up to deal infinite damage and recur every nonland permanent you desire.