Light of Promise, Prosperous Innkeeper, and Scurry Oak

Prerequisites

• Light of Promise on the battlefield
• Prosperous Innkeeper on the battlefield
• Scurry Oak on the battlefield

Steps

1. Gain life
2. Light of Promise triggers, putting a +1/+1 counter on Scurry Oak
3. Scurry Oak triggers, creating a creature token
4. When the creature token enters the battlefield, Prosperous Innkeeper triggers, causing you to gain 1 life
5. Repeat from step 2

Results

• Infinite ETB
• Infinite lifegain triggers
• Infinite lifegain
• Infinite creature tokens
• Infinite +1/+1 counters on a creature