Pirated Copy, and Felidar Guardian

Prerequisites

• Pirated Copy in hand
• Felidar Guardian on the battlefield

Steps

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

Results

• Infinite LTB
• Infinite ETB