Vesuvan Doppelganger, and Felidar Guardian

Prerequisites

• Vesuvan Doppelganger in hand
• Felidar Guardian on the battlefield

Steps

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

Results

• Infinite LTB
• Infinite ETB