Evil Twin, and Wispweaver Angel

Prerequisites

• Evil Twin in hand
• Wispweaver Angel on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB