Herd Baloth, Light of Promise, and Ajani's Welcome

Prerequisites

• Herd Baloth on the battlefield
• Light of Promise on the battlefield
• Ajani's Welcome on the battlefield
• Light of Promise attached to Herd Baloth
• You have a way to gain life

Steps

1. Gain any amount of life
2. Light of Promise triggers, putting a number of +1/+1 counters on Herd Baloth equal to the amount of life gained
3. Herd Baloth triggers, creating a 4/4 Beast creature token
4. The Beast enters the battlefield, triggering Ajani's Welcome, causing you to gain 1 life
5. Repeat from step 2

Results

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