Emeria Shepherd + Trenching Steed + World Shaper + Yahenni, Undying Partisan

WBG identity

Commander legal

The 4 combo pieces

• Emeria Shepherd
• Trenching Steed
• World Shaper
• Yahenni, Undying Partisan

How to execute it

1. Activate Trenching Steed 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

What the combo produces

• Infinite creature LTB
• Infinite death triggers
• Infinite ETB
• Infinite landfall triggers
• Infinite sacrifice triggers
• Infinite self-mill
• Return all nonland permanents from your graveyard to the battlefield