Intruder Alarm, and Hell's Caretaker

Prerequisites

• Intruder Alarm on the battlefield
• Hell's Caretaker on the battlefield
• undefined

Steps

1. Tap Hell's Caretaker and sacrifice another creature to returning a creature in your graveyard to the battlefield
2. When that creature enters the battlefield, Intruder Alarm triggers untapping all creatures
3. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers
• Infinite untap of creatures
• Infinite mana creatures you control can produce