Fallaji Wayfarer, Intruder Alarm, and Cavern Harpy

Prerequisites

• Fallaji Wayfarer on the battlefield
• Intruder Alarm on the battlefield
• Cavern Harpy in hand
• You control an additional blue or black creature

Steps

1. Cast Cavern Harpy by tapping Fallaji Wayfarer and a blue or black creature
2. Cavern Harpy enters the battlefield, triggering itself and Intruder Alarm
3. Resolve the Cavern Harpy trigger, returning it from the battlefield to your hand
4. Resolve the Intruder Alarm trigger, untapping all creatures
5. Repeat

Results

• Infinite ETB
• Infinite LTB
• Infinite mana creatures you control can produce
• Infinite storm count
• Infinite untap of all creatures