Emeria Shepherd + Lumra, Bellow of the Woods + Trenching Steed

Prerequisites

• You control a Plains or have a Plains in your graveyard.
• You do not have any static effects boosting your creatures' toughness.

Steps

1. 1Cast Lumra by paying .
2. 2When Lumra enters, it triggers.
3. 3Holding priority, activate Trenching Steed by sacrificing a land.
4. 4Repeat step 3 until you control no lands.
5. 5When you sacrifice the last land, Lumra will die as a state-based action due to having 0 toughness.
6. 6Resolve the Lumra trigger from step 2, causing you to mill four cards and return all lands from your graveyard to the battlefield tapped.
7. 7When the lands enter, Emeria Shepherd triggers that many times.
8. 8Resolve an Emeria Shepherd trigger that was triggered by a Plains, returning Lumra from your graveyard to the battlefield.
9. 9Repeat from step 2.

Effects

• Infinite creature ETB
• Infinite creature LTB
• Infinite creature sacrifice triggers
• Infinite death triggers
• Infinite landfall triggers
• Infinite self-mill
• Put all permanent cards from your graveyard and library onto the battlefield