Undercover Operative, and Wispweaver Angel

Prerequisites

• Undercover Operative in hand
• Wispweaver Angel on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB