Lumra, Bellow of the Woods + Springheart Nantuko + Nissa, Resurgent Animist + Trenching Steed

Prerequisites

• You have at least two lands between the battlefield and your graveyard.
• You have a land card in hand.
• You are able to play a land this turn

Steps

1. 1Play any land.
2. 2When the land enters the battlefield, Springheart Nantuko triggers.
3. 3Holding priority, activate Trenching Steed by sacrificing a land.
4. 4Repeat step 3 until you control no lands.
5. 5Resolve the Springheart Nantuko trigger, causing you to pay to create a token copy of Lumra.
6. 6Put the token Lumra into your graveyard due to the legend rule.
7. 7The Lumra token's enter-the-battlefield ability triggers, causing you to mill four cards and returning all lands from your graveyard to the battlefield.
8. 8When the lands enter the battlefield, Springheart Nantuko and Nissa trigger that many times.
9. 9Resolve all Nissa triggers, adding for each trigger.
10. 10Resolve all but one Springheart Nantuko trigger, choosing not to pay and creating that many 1/1 Insect creature tokens.
11. 11Repeat from step 3.

Effects

• Infinite colored mana
• Infinite creature ETB
• Infinite creature LTB
• Infinite death triggers
• Infinite landfall triggers
• Infinite mana lands you control can produce
• Infinite self-mill
• Infinite untap of lands you control
• Put all lands from your library and graveyard onto the battlefield tapped