Appa, Steadfast Guardian, Will, Scion of Peace, and Appa, Loyal Sky Bison

Prerequisites

• Appa, Steadfast Guardian in hand
• Will, Scion of Peace on the battlefield
• Appa, Loyal Sky Bison in hand
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB
• Infinite creature tokens
• Infinite storm count