Sakashima the Impostor, and Wispweaver Angel

Prerequisites

• Sakashima the Impostor in hand
• Wispweaver Angel on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB