Kodama of the East Tree + Arid Archway + Springheart Nantuko

Kodama of the East Tree

Arid Archway

Springheart Nantuko

How it works

1. Play Arid Archway.
2. When Arid Archway enters the battlefield, it, Springheart Nantuko, and Kodama of the East Tree trigger.
3. Resolve the Kodama of the East Tree trigger, choosing not to put anything from your hand onto the battlefield.
4. Resolve the Arid Archway trigger, returning it from the battlefield to your hand.
5. Resolve the Springheart Nantuko trigger, creating a token.
6. When the token enters the battlefield, Kodama triggers, putting Arid Archway from your hand onto the battlefield.
7. When Arid Archway enters the battlefield, it and Springheart Nantuko trigger.
8. Repeat from step 4.

This engine turns the self-bouncing nature of Arid Archway into a loop fueled by Kodama of the East Tree and Springheart Nantuko. Whenever Arid Archway enters the battlefield, its own trigger bounces it back to your hand while Springheart Nantuko's landfall ability (or its triggered copy effect) lets you pay to create a token copy. The secret glue is Kodama of the East Tree's static trigger, which watches that new token enter and immediately drops Arid Archway right back onto the battlefield from your hand to restart the entire cycle.