Quintorius, Field Historian + Extractor Demon + Ashnod's Altar + Sundering Archaic

Quintorius, Field Historian

Extractor Demon

Ashnod's Altar

Sundering Archaic

How it works

1. Activate Ashnod's Altar by sacrificing another creature, adding CC.
2. When the creature dies, Extractor Demon triggers, causing you to mill two cards if your graveyard is empty, or causing an opponent to mill two cards otherwise.
3. If your library is empty, activate [[Permanent with "Pay Mana: Put target card from your graveyard on the bottom of your library"]] by paying 2, putting a card from your graveyard onto the bottom of your library.
4. Quintorius triggers, creating a 3/2 Spirit creature token.
5. Repeat.

This ingenious loop relies on Ashnod's Altar to continuously sacrifice creatures for colorless mana, which then fuels the activation cost of Sundering Archaic to cycle cards back from your graveyard into your library. As those creatures leave the battlefield and graveyard, Extractor Demon triggers to mill your library and fuel the engine, while Quintorius, Field Historian transforms every single card leaving your graveyard into a fresh 3/2 Spirit token to keep the sacrifices going. The result is a self-sustaining storm of death and rebirth that buries your opponents in infinite triggers and near-infinite mana.