Stunt Double, and Felidar Guardian

Prerequisites

• Stunt Double in hand
• Felidar Guardian on the battlefield

Steps

1. Cast Stunt Double by paying its mana cost, choosing to have it enter the battlefield as a copy of Felidar Guardian When Stunt Double enters the battlefield, it triggers, blinking Felidar Guardian
2. When Felidar Guardian enters the battlefield, it triggers, blinking Stunt Double
3. Choose to have Stunt Double enter the battlefield as a copy of Felidar Guardian
4. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB