Appa, Steadfast Guardian + Sage of the Beyond + Appa, Loyal Sky Bison

Appa, Steadfast Guardian

Sage of the Beyond

Appa, Loyal Sky Bison

How it works

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