Commander Liara Portyr, Felidar Guardian, and Appa, Loyal Sky Bison

Prerequisites

• Commander Liara Portyr on the battlefield
• Felidar Guardian in hand
• Appa, Loyal Sky Bison in hand
• available

Steps

1. Declare two creatures as attackers, ensuring to attack two different opponents
2. Commander Liara Portyr triggers, causing spells you cast from exile this turn to cost less to cast
3. Cast Appa by paying its mana cost
4. When Appa enters, it triggers, exiling Felidar Guardian with the ability to cast it from exile later
5. Cast Felidar Guardian from exile by paying due to Commander Liara Portyr
6. When Felidar Guardian enters, it triggers, blinking Appa Repeat from step 3

Results

• Infinite LTB
• Infinite ETB
• Infinite storm count