Hulking Metamorph, and Wispweaver Angel

Prerequisites

• Hulking Metamorph in hand
• Wispweaver Angel on the battlefield

Steps

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

Results

• Infinite ETB
• Infinite LTB