How can you create a combo with Grenzo, Dungeon Warden, The Cauldron of Eternity, Phyrexian Altar, Dark Ritual, Shipwreck Dowser?
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[START OF COMBO]This combo can be formed with Grenzo, Dungeon Warden, The Cauldron of Eternity, Phyrexian Altar, Dark Ritual, Shipwreck Dowser

Color identity: UBR
Mana cost: {B}
Steps:
  1. Cast Dark Ritual by paying {B}, adding {B}{B}{B}.
  2. Activate Phyrexian Altar by sacrificing Shipwreck Dowser, adding one mana of any color.
  3. When Shipwreck Dowser dies, The Cauldron of Eternity triggers, putting Shipwreck Dowser from your graveyard onto the bottom of your library.
  4. Activate Grenzo by paying {2}, putting Shipwreck Dowser from the bottom of your library into your graveyard, and then putting it onto the battlefield.
  5. When Shipwreck Dowser 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.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite magecraft triggers
  - Infinite sacrifice triggers
  - Infinite storm count
  - Put all creature cards with power less than or equal to Grenzo's from your library onto the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Grenzo, Dungeon Warden must be on the battlefield
  - The Cauldron of Eternity must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Dark Ritual must be in your hand
  - Shipwreck Dowser must be on the battlefield
  - Grenzo has power 2 or greater.
[END OF COMBO PREREQUISITES]
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