Intruder Alarm, and Whitemane Lion

Prerequisites

• Intruder Alarm on the battlefield
• Whitemane Lion 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 Whitemane Lion by paying
3. Whitemane Lion enters the battlefield, triggering Intruder Alarm and Whitemane Lion
4. Resolve the Intruder Alarm's trigger, untapping all creatures you control
5. Resolve the Whitemane Lion'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