Hell's Caretaker, Activated Sleeper, and Dynaheir, Invoker Adept

Prerequisites

• Hell's Caretaker on the battlefield
• Activated Sleeper in the graveyard
• Dynaheir, Invoker Adept on the battlefield

Steps

1. During your upkeep, activate Hell's Caretaker by tapping and sacrificing it, returning Activated Sleeper from your graveyard to the battlefield as a copy of Hell's Caretaker
2. Activate Activated Sleeper by tapping and sacrificing it, returning Hell's Caretaker from your graveyard to the battlefield
3. Repeat

Results

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