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 colored mana

Infinite lifegain triggers

Infinite lifegain

Infinite Treasure tokens

Infinite landfall triggers

Infinite Food tokens

Infinite card draw

Infinite draw triggers

Kodama of the East Tree

Petrified Field

Echoing Deeps

Tireless Provisioner

Spelunking

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 "Petrified Field"