Jan Jansen, Chaos Crafter, and Intruder Alarm

Prerequisites

• Jan Jansen, Chaos Crafter on the battlefield
• Intruder Alarm on the battlefield

Steps

1. Activate Jan Jansen's second ability by tapping it and sacrificing the noncreature artifact, creating two 1/1 Construct creature tokens
2. The Constructs enter the battlefield, triggering Intruder Alarm twice
3. Resolve the first trigger, untapping all creatures
4. Activate Jan Jansen's first ability by tapping it and sacrificing a Construct, creating two Treasure tokens
5. Resolve the second Intruder Alarm trigger from step 2, untapping all creatures
6. Repeat

Results

• Infinite artifact ETB
• Infinite artifact LTB
• Infinite artifact sacrifice triggers
• Infinite artifact tokens
• Infinite colored mana
• Infinite creature tokens
• Infinite death triggers
• Infinite creature ETB
• Infinite creature LTB
• Infinite mana creatures you control can produce
• Infinite creature sacrifice triggers
• Infinite Treasure tokens
• Infinite untap of creatures