Hell's Caretaker, Corridor Monitor, and Pestermite

Prerequisites

• Hell's Caretaker on the battlefield
• Corridor Monitor on the battlefield
• Pestermite in the graveyard

Steps

1. During your upkeep, activate Hell's Caretaker by sacrificing Corridor Montior, returning Pestermite from your graveyard to the battlefield
2. Pestermite enters the battlefield, untapping Hell's Caretaker
3. Activate Hell's Caretaker by sacrificing Pestermite, returning Corridor Monitor from your graveyard to the battlefield
4. Corridor Monitor enters the battlefield, untapping Hell's Caretaker
5. Repeat

Results

• Infinite death triggers
• Infinite ETB
• Infinite LTB
• Infinite sacrifice triggers