Mirrorhall Mimic // Ghastly Mimicry, and Felidar Guardian

Prerequisites

• Mirrorhall Mimic // Ghastly Mimicry in hand
• Felidar Guardian on the battlefield

Steps

1. Cast Mirrorhall Mimic by paying its mana cost, choosing to have it enter the battlefield as a copy of Felidar Guardian When Mirrorhall Mimic enters the battlefield, it triggers, blinking Felidar Guardian
2. When Felidar Guardian enters the battlefield, it triggers, blinking Mirrorhall Mimic
3. Choose to have Mirrorhall Mimic enter the battlefield as a copy of Felidar Guardian
4. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB