Appa, Steadfast Guardian + Ezzaroot Channeler + Aang, the Last Airbender

Appa, Steadfast Guardian

Ezzaroot Channeler

Aang, the Last Airbender

How it works

1. Cast Appa by paying .
2. When Appa enters, it triggers, airbending Aang.
3. Cast Aang from exile by paying 0.
4. Appa triggers, creating a 1/1 Ally creature token.
5. When Aang enters, it triggers, airbending Appa.
6. Cast Appa from exile by paying 0.
7. Repeat from step 2.

This infinite loop hinges on the clever wording of Appa, Steadfast Guardian and Aang, the Last Airbender, which both let you recast each other's exiled forms for a mere {2}—a cost entirely erased by the life-gain discount of Ezzaroot Channeler. As Ezzaroot Channeler taps to pad your life total, it reduces that casting cost down to zero, letting you repeatedly exile and recast Appa and Aang to trigger their airbend abilities back and forth indefinitely. Each iteration not only loops their enter-the-battlefield triggers for endless leaves-the-battlefield and entry events, but also feeds Appa's secondary trigger to flood the board with an infinite army of 1/1 white Ally creature tokens and an unbounded storm count.