Cauldron Familiar, Witch's Oven, Intruder Alarm, March of the Machines, and The Immortal Sun

Prerequisites

• Cauldron Familiar on the battlefield
• Witch's Oven on the battlefield
• Intruder Alarm on the battlefield
• March of the Machines on the battlefield
• The Immortal Sun on the battlefield
• Witch's Oven does not have summoning sickness

Steps

1. Activate Witch's Oven by tapping it and sacrificing Cauldron Familiar, creating a Food artifact token
2. When the Food enters the battlefield as a creature due to March of the Machines, Intruder Alarm triggers, untapping all creatures
3. Activate Cauldron Familiar by sacrificing a Food token, returning it from your graveyard to the battlefield
4. When Cauldron Familar enters the battlefield, it and Intruder Alarm trigger
5. Resolve the Cauldron Familiar trigger, causing each opponent to lose 1 life and you to gain 1 life
6. Resolve the Intruder Alarm trigger, untapping all creatures
7. Repeat

Results

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