Anticausal Vestige, Cloudstone Curio, and Progenitor Mimic

Prerequisites

• Anticausal Vestige on the battlefield
• Cloudstone Curio on the battlefield
• Progenitor Mimic in hand
• available

Steps

1. Cast Progenitor Mimic by paying its mana cost
2. Choose to have it enter as a copy of Anticausal Vestige
3. When Progenitor Mimic enters, Cloudstone Curio triggers, returning Anticausal Vestige from the battlefield to your hand
4. When Anticausal Vestige leaves the battlefield, it triggers, causing you to draw a card and and put Anticausal Vestige from your hand onto the battlefield
5. When Anticausal Vestige enters, Cloudstone Curio triggers, returning Progenitor Mimic from the battlefield to your hand
6. When Progenitor Mimic leaves the battlefield, it triggers, causing you to draw a card and put Progenitor Mimic from your hand onto the battlefield as a copy of Anticausal Vestige
7. Repeat from step 2

Results

• Infinite card draw
• Near-infinite ETB
• Infinite draw triggers
• Near-infinite storm count
• Near-infinite LTB