Hell's Caretaker + Activated Sleeper + Frostcliff Siege

Hell's Caretaker

Activated Sleeper

Frostcliff Siege

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 clever loop spins up an endless recursion of life and death by bouncing Hell's Caretaker and Activated Sleeper back and forth from the graveyard to the battlefield. During your upkeep, you tap Hell's Caretaker to sacrifice itself and bring back Activated Sleeper as a fresh copy of the Caretaker, which can immediately tap to sacrifice *itself* and resurrect the original. While Frostcliff Siege might be sitting on the board providing other passive benefits depending on your chosen faction, it's this self-sustaining engine between the Caretaker and the Sleeper that generates an infinite storm of creature entry, leave-the-battlefield, and death triggers.