Felidar Guardian, and Clever Impersonator

Prerequisites

• Felidar Guardian on the battlefield
• Clever Impersonator in hand
• available

Steps

1. Cast Clever Impersonator by paying
2. Choose to have Clever Impersonator enter the battlefield as a copy of Felidar Guardian
3. Clever Impersonator enters the battlefield, blinking Felidar Guardian
4. Felidar Guardian enters the battlefield, blinking Clever Impersonator
5. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB