Spawning Grounds, Intruder Alarm, and Voyaging Satyr

Prerequisites

• Spawning Grounds on the battlefield
• Intruder Alarm on the battlefield
• Voyaging Satyr on the battlefield
• Spawning Grounds attached to any Forest you control
• Voyaging Satyr does not have summoning sickness

Steps

1. Activate the land with Spawning Grounds attached by tapping it, creating a 5/5 Beast creature token
2. The Beast enters the battlefield, triggering Intruder Alarm, untapping all creatures
3. Activate Voyaging Satyr by tapping it, untapping the land with Spawning Grounds attached
4. Repeat

Results

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