Lumra, Bellow of the Woods + Springheart Nantuko + Tireless Provisioner + Lithatog
Infinite Mill: Infinite LTB, Infinite ETB, Infinite death triggers, Infinite self-mill, Infinite landfall triggers, Infinitely large creature until end of turn, Infinite mana lands you control can produce, Infinite colored mana, Put all lands from your library and graveyard onto the battlefield tapped, Infinite lifegain triggers, Infinite lifegain, Infinite Treasure tokens, Infinite Food tokens, Infinite untap of lands you control
Play any land.
When the land enters the battlefield, Springheart Nantuko triggers.
Holding priority, activate Lithatog by sacrificing a land.
Repeat step 3 until you control no lands.
Resolve the Springheart Nantuko trigger, causing you to pay {1}{G} to create a token copy of Lumra.
Put the token Lumra into your graveyard due to the legend rule.
The Lumra token's enter-the-battlefield ability triggers, causing you to mill four cards and returning all lands from your graveyard to the battlefield tapped.
When the lands enter the battlefield, Springheart Nantuko and Tireless Provisioner trigger that many times.
Resolve all Tireless Provisioner triggers, creating at least two Treasure tokens, and then an additional Clue or Treasure token for each remaining trigger.
Holding priority, activate two Treasures by tapping and sacrificing them, adding {1}{G}.
Resolve all but one Springheart Nantuko trigger, choosing not to pay and creating that many 1/1 Insect creature tokens.
Repeat from step 3.
Cards: Lumra, Bellow of the Woods, Springheart Nantuko, Tireless Provisioner, Lithatog