Intruder Alarm, and Man-o'-War

Prerequisites

• Intruder Alarm on the battlefield
• Man-o'-War in hand
• Creatures you control can tap to produce at least

Steps

1. Activate all mana-producing creatures you control by tapping them, adding at least
2. Cast Man-o'-War by paying
3. Man-o'-War enters the battlefield, triggering Intruder Alarm and Man-o'-War
4. Resolve the Intruder Alarm's trigger, untapping all creatures you control
5. Resolve the Man-o'-War's trigger, returning it to your hand
6. Repeat

Results

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