Vesuvan Doppelganger, and Wispweaver Angel

Prerequisites

• Vesuvan Doppelganger in hand
• Wispweaver Angel on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB