Play Lotus Field. When it enters untapped due to Spelunking, it triggers.
Holding priority, activate Lotus Field by tapping it, adding {G}{G}{G}.
Resolve the Lotus Field trigger, sacrificing it and Echoing Deeps.
Activate Aftermath Analyst by paying {3}{G} and sacrificing it, returning all land cards from your graveyard to the battlefield untapped due to Spelunking. Choose to have Echoing Deeps enter as a copy of Lotus Field.
When Echoing Deeps and Lotus Field enter, they each trigger.
Holding priority, activate Echoing Deeps, Lotus Field and two other mana-producing lands except Shifting Woodland by tapping them, adding at least {5}{G}{G}{G}.
Resolve the Echoing Deeps and Lotus Field triggers, sacrificing them and the lands tapped for mana in step 6.
Activate Shifting Woodland's first ability by tapping it, adding {G}.
Activate Shifting Woodland's second ability by paying {2}{G}{G}, causing it to become a copy of Aftermath Analyst.
Activate Shifting Woodland by paying {3}{G} and sacrificing it, returning all land cards from your graveyard to the battlefield untapped due to Spelunking. Choose to have Echoing Deeps enter as a copy of Lotus Field.
Repeat from step 5.

Infinite colored mana

Infinite mana lands you control can produce

Infinite landfall triggers

Lotus Field

Echoing Deeps

Aftermath Analyst

Shifting Woodland

Spelunking

Play Petrified Field.
When Petrified Field enters the battlefield, Kodama of the East Tree and Tireless Provisioner trigger.
Resolve the Kodama of the East Tree trigger, putting nothing onto the battlefield.
Holding priority, activate Petrified Field's second ability by tapping and sacrificing it, returning Echoing Deeps from your graveyard to your hand.
Resolve the Tireless Provisioner trigger, creating a token.
When the token enters the battlefield, Kodama of the East Tree triggers, putting Echoing Deeps from your hand onto the battlefield untapped as a copy of Petrified Field.
When Echoing Deeps enters the battlefield, Tireless Provisioner triggers.
Holding priority, activate Echoing Deeps using Petrified Field's second ability by tapping and sacrificing it, returning Petrified Field from your graveyard to your hand.
Resolve the Tireless Provisioner trigger, creating a token.
When the token enters the battlefield, Kodama of the East Tree triggers, putting Petrified Field from your hand onto the battlefield.
When Petrified Field enters the battlefield, Tireless Provisioner triggers.
Repeat from step 4.

Infinite lifegain triggers

Infinite lifegain

Infinite Treasure tokens

Infinite Food tokens

Kodama of the East Tree

Petrified Field

Tireless Provisioner

Play Petrified Field.
When Petrified Field enters the battlefield, Kodama of the East Tree and Field of the Dead trigger.
Resolve the Kodama of the East Tree trigger, putting nothing onto the battlefield.
Holding priority, activate Petrified Field's second ability by tapping and sacrificing it, returning Echoing Deeps from your graveyard to your hand.
Resolve the Field of the Dead trigger, creating a token.
When the token enters the battlefield, Kodama of the East Tree triggers, putting Echoing Deeps from your hand onto the battlefield as a copy of Petrified Field.
When Echoing Deeps enters the battlefield, Field of the Dead and Amulet of Vigor trigger.
Resolve the Amulet of Vigor trigger, untapping Echoing Deeps.
Holding priority, activate Echoing Deeps using Petrified Field's second ability by tapping and sacrificing it, returning Petrified Field from your graveyard to your hand.
Resolve the Field of the Dead trigger, creating a token.
When the token enters the battlefield, Kodama of the East Tree triggers, putting Petrified Field from your hand onto the battlefield.
When Petrified Field enters the battlefield, Field of the Dead triggers.
Repeat from step 4.

Infinite ETB

Infinite creature tokens

Field of the Dead

Amulet of Vigor

Combos with "Echoing Deeps"