Earthcraft, and Squirrel Nest

Prerequisites

• Earthcraft on the battlefield
• Squirrel Nest on the battlefield
• Squirrel Nest is attached to a basic land you control

Steps

1. Activate the enchanted basic land by tapping it, creating a 1/1 green Squirrel creature token
2. Activate Earthcraft by tapping an untapped creature you control, untapping the enchanted basic land
3. Repeat

Results

• Infinite ETB
• Infinite tapped creature tokens