Midnight Guard, Ashaya, Soul of the Wild, and Squirrel Nest

Prerequisites

• Midnight Guard on the battlefield
• Ashaya, Soul of the Wild on the battlefield
• Squirrel Nest on the battlefield

Steps

1. Activate Midnight Guard by tapping it, creating a 1/1 Squirrel creature token
2. When the Squirrel enters the battlefield, Midnight Guard triggers, untapping it
3. Repeat

Results

• Infinite creature tokens
• Infinite ETB