Appa, Steadfast Guardian + Will, Scion of Peace + Aang, Airbending Master

Appa, Steadfast Guardian

Will, Scion of Peace

Aang, Airbending Master

How it works

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