Appa, Steadfast Guardian + Sage of the Beyond + Aang, the Last Airbender

Appa, Steadfast Guardian

Sage of the Beyond

Aang, the Last Airbender

How it works

1. Cast Appa by paying 2.
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.