Kodama of the East Tree + Petrified Field + Echoing Deeps + Felidar Retreat + Archelos, Lagoon Mystic

Kodama of the East Tree

Petrified Field

Echoing Deeps

Felidar Retreat

Archelos, Lagoon Mystic

How it works

1. Play Petrified Field.
2. When Petrified Field enters the battlefield, Kodama of the East Tree and Felidar Retreat 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 Felidar Retreat trigger, creating a token.
6. 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.
7. When Echoing Deeps enters the battlefield, Felidar Retreat 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 Felidar Retreat trigger, creating a token.
10. When the 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, Felidar Retreat triggers.
12. Repeat from step 4.

This elegant loop turns a pair of swapping lands into an endless engine of creation, fueled by Kodama of the East Tree's ability to cheat permanents into play whenever another permanent enters your board. As the lands bounce back and forth between the battlefield and your graveyard via Petrified Field and Echoing Deeps, every cycle generates a fresh token through Felidar Retreat's landfall trigger. Meanwhile, Archelos, Lagoon Mystic quietly ensures that your lands and tokens don't slow down the momentum by dictating whether incoming permanents enter tapped or untapped.