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

Grenzo, Dungeon Warden

The Cauldron of Eternity

Phyrexian Altar

Dark Ritual

Archaeomancer

How it works

1. Cast Dark Ritual by paying , adding .
2. Activate Phyrexian Altar by sacrificing Archaeomancer, adding one mana of any color.
3. When Archaeomancer dies, The Cauldron of Eternity triggers, putting Archaeomancer from your graveyard onto the bottom of your library.
4. Activate Grenzo by paying 2, putting Archaeomancer from the bottom of your library into your graveyard, and then putting it onto the battlefield.
5. When Archaeomancer 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 creates infinite mana and endless triggers by repeatedly cycling Archaeomancer from the battlefield back to the bottom of your library and right back onto the battlefield via Grenzo, Dungeon Warden. As Archaeomancer enters, its triggered ability lets you fish Dark Ritual back out of your graveyard to continually fund the loop, while Phyrexian Altar provides the sacrifice outlet and color-fixing mana needed to keep the engine turning. Meanwhile, The Cauldron of Eternity quietly acts as the vital bridge, ensuring that any creature you control—including Archaeomancer—is tucked back onto the bottom of your library when it dies instead of staying in the graveyard, perfectly setting it up for Grenzo's next activation.