Hell's Caretaker + Activated Sleeper + Samut, Tyrant Smasher

Hell's Caretaker

Activated Sleeper

Samut, Tyrant Smasher

How it works

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.

This recursive loop turns your graveyard into a revolving door by leveraging Hell's Caretaker during your upkeep to resurrect Activated Sleeper, which immediately enters the battlefield as a fresh copy of the Caretaker. Because Activated Sleeper's copy effect triggers on entering the battlefield from a graveyard where it was just placed from the battlefield, it perpetually mimics the original sacrifice engine. Meanwhile, Samut, Tyrant Smasher ensures that haste is granted so the newly returned copy doesn't suffer from summoning sickness and can immediately tap to keep the cycle going.