Play Petrified Field.
When Petrified Field enters the battlefield, Kodama of the East Tree and Dragonback Assault 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 Dragonback Assault 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, Dragonback Assault 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 Dragonback Assault 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, Dragonback Assault triggers.
Repeat from step 4.

Infinite creature ETB

Infinite creature tokens

Infinite landfall triggers

Kodama of the East Tree

Petrified Field

Echoing Deeps

Dragonback Assault

Horizon Explorer

Play Petrified Field.
When Petrified Field enters the battlefield, Kodama of the East Tree and Dragonback Assault 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 Dragonback Assault 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, Dragonback Assault and Tiller Engine trigger.
Resolve the Tiller Engine 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 Dragonback Assault 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, Dragonback Assault triggers.
Repeat from step 4.

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