Grenzo, Dungeon Warden + The Cauldron of Eternity + Phyrexian Altar + Dark Ritual + Revolutionist

Grenzo, Dungeon Warden

The Cauldron of Eternity

Phyrexian Altar

Dark Ritual

Revolutionist

How it works

1. Cast Dark Ritual by paying , adding .
2. Activate Phyrexian Altar by sacrificing Revolutionist, adding one mana of any color.
3. When Revolutionist dies, The Cauldron of Eternity triggers, putting Revolutionist from your graveyard onto the bottom of your library.
4. Activate Grenzo by paying 2, putting Revolutionist from the bottom of your library into your graveyard, and then putting it onto the battlefield.
5. When Revolutionist enters the battlefield, it triggers, returning Dark Ritual from your graveyard to your hand.
6. Repeat.
7. Once you have infinite mana, you may activate Grenzo's ability any number of times.

This ingenious loop relies on The Cauldron of Eternity's passive ability to constantly recycle your creatures to the bottom of your library whenever they die, setting them up perfectly for Grenzo, Dungeon Warden's activation. By sacrificing Revolutionist to Phyrexian Altar, you generate the mana needed to fuel Grenzo while simultaneously triggering Revolutionist's entry effect—aided by Dark Ritual's initial burst of black mana—to continuously return the instant to your hand. As Revolutionist hits the graveyard, The Cauldron of Eternity tucks it away just in time for Grenzo to cheat it right back onto the battlefield, creating an endless engine of sacrifices, mana, and recursion.