Intruder Alarm, and Kor Skyfisher

Prerequisites

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