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

5-card combo · UBR

Verdict

Yes — this 5-card loop generates infinite colored mana and assembles your entire creature library onto the battlefield.

Cards required

Cheapest stack total

$4.27

Color identity

UBR

Popularity

0 decks

Format

Commander

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The engine cycles Salvager of Secrets through death, The Cauldron of Eternity's replacement trigger, and Grenzo, Dungeon Warden's bottom-of-library activation. Dark Ritual pays for itself each loop via Salvager's ETB, while Phyrexian Altar converts each sacrifice into the colored mana Grenzo needs to fire again. Grenzo decks in Grixis already want the Warden, the Altar, and a recursion safety net — The Cauldron of Eternity is the glue that makes the library the graveyard's waiting room.

How it works

Prerequisites

Grenzo has power 2 or greater.

Steps

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

Result

Infinite colored mana; Infinite death triggers; Infinite ETB; Infinite LTB; Infinite magecraft triggers; Infinite sacrifice triggers; Infinite storm count; Put a selection of creature cards from your library onto the battlefield

Cheaper, tighter, alternate lines

Myr Retriever or Hana Kami can substitute for Salvager of Secrets if the goal is simply recurring a key spell, though Salvager is the tightest fit here since it directly returns Dark Ritual. Once mana is infinite, Grenzo's activations flood the battlefield with whatever creatures remain in the library — pair with Blood Artist or Zulaport Cutthroat to convert the death triggers into a kill without needing a separate outlet.

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

How it works

Cheaper, tighter, alternate lines

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