Hell's Caretaker + Body Double + Tannuk, Steadfast Second

Hell's Caretaker

Body Double

Tannuk, Steadfast Second

How it works

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

This clever loop relies on trading places between Hell's Caretaker and Body Double to endlessly trigger sacrifices and enters-the-battlefield effects during your upkeep. When Hell's Caretaker sacrifices itself to pull Body Double from the graveyard, Body Double enters as a fresh copy of Hell's Caretaker—ready to tap and sacrifice *itself* to bring the original Hell's Caretaker right back. Meanwhile, Tannuk, Steadfast Second sits on the battlefield providing haste, which might seem tangential to the loop itself, but its presence and warp-granting text are part of the broader strategy tying this engine together.