Squirrel Nest, Intruder Alarm, and Ley Druid

Prerequisites

• Squirrel Nest on the battlefield
• Intruder Alarm on the battlefield
• Ley Druid on the battlefield
• Squirrel Nest attached to any Forest you control
• Ley Druid 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 Ley Druid 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