Cauldron Familiar, Witch's Oven, Dross Scorpion, and Encroaching Mycosynth

Prerequisites

• Cauldron Familiar on the battlefield
• Witch's Oven on the battlefield
• Dross Scorpion on the battlefield
• Encroaching Mycosynth on the battlefield

Steps

1. Activate Witch's Oven by tapping it and sacrificing Cauldron Familiar
2. When Cauldron Familiar dies, Dross Scorpion triggers, untapping Witch's Oven
3. Resolve the Witch's Oven ability, creating a Food artifact token
4. Activate Cauldron Familiar by sacrificing a Food token, returning it from your graveyard to the battlefield
5. When Cauldron Familiar enters the battlefield, it triggers, causing each opponent to lose 1 life and you to gain 1 life
6. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite lifegain
• Infinite lifegain triggers
• Infinite lifeloss
• Infinite LTB
• Infinite sacrifice triggers