Kodama of the East Tree
Petrified Field
Echoing Deeps
Zendikar's Roil
Archelos, Lagoon Mystic

   Prerequisites

What do I need to start this combo?
Echoing Deeps in your graveyard.
Petrified Field in hand.
All other permanents on the battlefield.
You are able to play a land this turn.

   Steps

How does this combo work?
1
Play Petrified Field.
2
When Petrified Field enters the battlefield, Kodama of the East Tree and Zendikar's Roil 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 Zendikar's Roil 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, Zendikar's Roil 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 Zendikar's Roil 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, Zendikar's Roil triggers.
12
Repeat from step 4.

   Results

What do I get from this combo?
Infinite creature tokens
Infinite ETB
Infinite landfall triggers