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

5-card combo · UBR

Verdict

Yes — this 5-card loop converts a single Dark Ritual into infinite colored mana and unlimited Grenzo activations that can drop your entire library onto the battlefield.

Cards required

Cheapest stack total

$7.58

Color identity

UBR

Popularity

0 decks

Format

Commander

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The engine runs on a tight cycle: sacrifice Vampire Charmseeker to Phyrexian Altar for one mana, The Cauldron of Eternity queues it to the bottom of the library, Grenzo pays 2 to flip it immediately onto the battlefield, and its ETB returns Dark Ritual to hand. Each iteration nets mana and reloads the sorcery, making this a Grixis value-engine that fits any Grenzo, Dungeon Warden shell running reanimation support. The table sees incremental loop triggers before the kill lands, so interaction on The Cauldron of Eternity or Phyrexian Altar ends the chain.

How it works

Prerequisites

Grenzo has power 2 or greater.

Steps

Cast Dark Ritual by paying , adding .
Activate Phyrexian Altar by sacrificing Vampire Charmseeker, adding one mana of any color.
When Vampire Charmseeker dies, The Cauldron of Eternity triggers, putting Vampire Charmseeker from your graveyard onto the bottom of your library.
Activate Grenzo by paying , putting Vampire Charmseeker from the bottom of your library into your graveyard, and then putting it onto the battlefield.
When Vampire Charmseeker 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

Ashnod's Altar substitutes for Phyrexian Altar and produces colorless instead of any color — workable but tighter on the Dark Ritual recast. Any creature with an ETB that returns a sorcery or instant to hand can swap Vampire Charmseeker in principle, but the Cauldron dependency means the creature also needs to survive as a graveyard target; few candidates match that cleanly. Once infinite mana is established, point Grenzo at Walking Ballista or any Haste outlet already in the library as the closer.

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

How it works

Cheaper, tighter, alternate lines

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