Appa, Steadfast Guardian, Felidar Guardian, and Urza's Incubator

Prerequisites

• Appa, Steadfast Guardian in hand or in the command zone
• Felidar Guardian in hand
• Urza's Incubator on the battlefield
• plus commander tax if applicable available

Steps

1. Cast Appa either from your hand or from the command zone by paying plus commander tax, if applicable
2. 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. When Felidar Guardian enters, it triggers, blinking Appa
5. Repeat from step 2

Results

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