Kodama of the East Tree, Archelos, Lagoon Mystic, Petrified Field, Echoing Deeps, and Springheart Nantuko

Prerequisites

• Kodama of the East Tree on the battlefield
• Archelos, Lagoon Mystic on the battlefield
• Petrified Field in hand
• Echoing Deeps in the graveyard
• Springheart Nantuko on the battlefield
• You are able to play a land this turn

Steps

1. Play Petrified Field
2. When Petrified Field enters the battlefield, Kodama of the East Tree and Springheart Nantuko 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 Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect 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 Archelos as a copy of Petrified Field
7. When Echoing Deeps enters the battlefield, Springheart Nantuko 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 Springheart Nantuko trigger, choosing not to pay and creating a 1/1 Insect 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, Springheart Nantuko triggers
12. Repeat from step 4

Results

• Infinite creature tokens
• Infinite ETB
• Infinite landfall triggers