Felidar Guardian, and Wispweaver Angel

Prerequisites

• Felidar Guardian in hand
• Wispweaver Angel on the battlefield
• available

Steps

1. Cast Felidar Guardian by paying its mana cost
2. When Felidar Guardian enters, it triggers, blinking Wispweaver Angel
3. When Wispweaver Angel enters, it triggers, blinking Felidar Guardian
4. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB