Felidar Guardian, and Icewind Stalwart

Prerequisites

• Felidar Guardian in hand
• Icewind Stalwart on the battlefield
• available

Steps

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

Results

• Infinite ETB
• Infinite LTB