Appa, Steadfast Guardian, Felidar Guardian, and Will, Scion of Peace

Prerequisites

• Appa, Steadfast Guardian in hand
• Felidar Guardian in hand
• Will, Scion of Peace on the battlefield
• available

Steps

1. Activate Will by tapping it, causing white and blue spells you cast to cost less for each life you've gained this turn
2. Cast Appa by paying When Appa enters, its first ability triggers, exiling Felidar Guardian with the ability to cast it later from exile
3. Cast Felidar Guardian from exile by paying
4. Appa's second ability triggers, creating a 1/1 Ally creature token
5. When Felidar Guardian enters, it triggers, blinking Appa
6. Repeat from step 3

Results

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