Ertha Jo, Frontier Mentor, Clock of Omens, Sphinx's Disciple, and Encroaching Mycosynth

Prerequisites

• Ertha Jo, Frontier Mentor on the battlefield
• Clock of Omens on the battlefield
• Sphinx's Disciple on the battlefield
• Encroaching Mycosynth on the battlefield

Steps

1. Activate Clock of Omens by tapping it and Sphinx's Disciple, targeting Sphinx's Disciple
2. Ertha Jo triggers, copying Clock of Omens' ability, targeting Clock of Omens
3. Resolve both Clock of Omens abilities, untapping it and Sphinx's Disciple
4. Sphinx's Disciple triggers, causing you to draw a card
5. Repeat

Results

• Infinite card draw
• Infinite draw triggers