Cauldron Familiar, Witch's Oven, Intruder Alarm, and Ensoul Artifact

Prerequisites

• Cauldron Familiar on the battlefield
• Witch's Oven on the battlefield
• Intruder Alarm on the battlefield
• Ensoul Artifact on the battlefield
• Witch's Oven does not have summoning sickness
• Ensoul Artifact attached to Witch's Oven

Steps

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