Molten Echoes, and Boggart Mob

Prerequisites

• Molten Echoes on the battlefield
• Boggart Mob in hand
• available

Steps

1. Cast Boggart Mob by paying its mana cost
2. When Boggart Mob enters the battlefield, its champion ability and Molten Echoes triggers
3. Resolve the Molten Echoes trigger, creating a token copy of Boggart Mob with haste
4. When the Boggart Mob token enters the battlefiled, its champion ability triggers, exiling the nontoken Boggart Mob until the token Boggart Mob leaves the battlefield
5. Resolve the champion ability from step 2, exiling the token Boggart Mob
6. The token Boggart Mob leaves the battlefield, returning the nontoken Boggart Mob from exile to the battlefield
7. Repeat from step 2

Results

• Infinite LTB
• Infinite ETB