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

Color identity: UBR
Mana cost: {B}
Steps:
  1. Cast Dark Ritual by paying {B}, adding {B}{B}{B}.
  2. Activate Phyrexian Altar by sacrificing Scholar of the Ages, adding one mana of any color.
  3. When Scholar of the Ages dies, The Cauldron of Eternity triggers, putting Scholar of the Ages from your graveyard onto the bottom of your library.
  4. Activate Grenzo by paying {2}, putting Scholar of the Ages from the bottom of your library into your graveyard, and then putting it onto the battlefield.
  5. When Scholar of the Ages enters the battlefield, it triggers, returning Dark Ritual and up to one other instant or sorcery 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
  - Put all instant and sorcery cards from your graveyard and library into your hand[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - All permanants must be on the battlefield
  - Grenzo has power 2 or greater.
[END OF COMBO PREREQUISITES]
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