Appa, Steadfast Guardian, Umori, the Collector, Felidar Guardian, and Thornscape Familiar

Prerequisites

• Appa, Steadfast Guardian in hand
• Umori, the Collector on the battlefield
• Felidar Guardian on the battlefield
• Thornscape Familiar on the battlefield
• available

Steps

1. Cast Appa by paying When Appa enters, its first ability triggers, exiling Felidar Guardian with the ability to cast it later from exile
2. Cast Felidar Guardian from exile by paying
3. Appa's second ability triggers, creating a 1/1 Ally creature token When Felidar Guardian enters, it triggers, blinking Appa
4. Repeat from step 2

Results

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