Ertha Jo, Frontier Mentor, Clock of Omens, Oreskos Sun Guide, and Encroaching Mycosynth

Prerequisites

• Ertha Jo, Frontier Mentor on the battlefield
• Clock of Omens on the battlefield
• Oreskos Sun Guide on the battlefield
• Encroaching Mycosynth on the battlefield

Steps

1. Activate Clock of Omens by tapping it and Oreskos Sun Guide, targeting Oreskos Sun Guide
2. Ertha Jo triggers, copying Clock of Omens' ability, targeting Clock of Omens
3. Resolve both Clock of Omens abilities, untapping it and Oreskos Sun Guide
4. Oreskos Sun Guide triggers, causing you to gain 2 life Repeat

Results

• Infinite lifegain triggers
• Infinite lifegain