Squirrel Nest, Intruder Alarm, and Stone-Seeder Hierophant

Prerequisites

• Squirrel Nest on the battlefield
• Intruder Alarm on the battlefield
• Stone-Seeder Hierophant on the battlefield
• Squirrel Nest attached to any Forest you control
• Stone-Seeder Hierophant does not have summoning sickness

Steps

1. Activate the land with Squirrel Nest attached by tapping it, creating a 1/1 Squirrel creature token
2. The Squirrel enters the battlefield, triggering Intruder Alarm, untapping all creatures
3. Activate Stone-Seeder Hierophant by tapping it, untapping the land with Squirrel Nest attached
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite untap of all creatures