Leonin Relic-Warder, and Encroaching Mycosynth

Prerequisites

• Leonin Relic-Warder in hand
• Encroaching Mycosynth on the battlefield
• available

Steps

1. Cast Leonin Relic-Warder by paying
2. When Leonin Relic-Warder enters the battlefield, its first ability triggers, exiling itself
3. When Leonin Relic-Warder leaves the battlefield, its second ability triggers, returning itself from exile to the battlefield
4. Repeat from step 2

Results

• Infinite ETB
• Infinite LTB