Requires

Steps

1. Play Petrified Field.
2. When Petrified Field enters the battlefield, Kodama of the East Tree and The Necrobloom trigger.
3. Resolve the Kodama of the East Tree trigger, putting nothing onto the battlefield.
4. Holding priority, activate Petrified Field's second ability by tapping and sacrificing it, returning Echoing Deeps from your graveyard to your hand.
5. Resolve the The Necrobloom trigger, creating a 0/1 Plant creature token.
6. When the creature token enters the battlefield, Kodama of the East Tree triggers, putting Echoing Deeps from your hand onto the battlefield untapped due to Spelunking as a copy of Petrified Field.
7. When Echoing Deeps enters the battlefield, The Necrobloom triggers.
8. 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.
9. Resolve the The Necrobloom trigger, creating a 0/1 Plant creature token.
10. When the creature token enters the battlefield, Kodama of the East Tree triggers, putting Petrified Field from your hand onto the battlefield.
11. When Petrified Field enters the battlefield, The Necrobloom triggers.
12. Repeat from step 4.

Results