How can you create a combo with Cloudstone Curio, Phyrexian Altar, Abhorrent Overlord?
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[START OF COMBO]This combo can be formed with Cloudstone Curio, Phyrexian Altar, Abhorrent Overlord

Color identity: B
Mana cost: {5}{B}{B}
Steps:
  1. Cast Abhorrent Overlord by paying {5}{B}{B}.
  2. When Abhorrent Overlord enters the battlefield, it and Cloudstone Curio trigger.
  3. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand from the battlefield.
  4. Resolve the Abhorrent Overlord trigger, creating a number of 1/1 Harpy creature tokens equal to your devotion to black.
  5. When the Harpys enter the battlefield, Cloudstone Curio triggers that many times.
  6. Resolve the first Cloudstone Curio trigger, returning Abhorrent Overlord to your hand from the battlefield.
  7. Resolve all remaining Cloudstone Curio triggers, choosing to return nothing to your hand from the battlefield.
  8. Activate Phyrexian Altar seven times by sacrificing seven Harpys, adding {5}{B}{B}.
  9. Repeat.
  10. If your devotion to black excluding Abhorrent Overlord is at least six, this combo will net infinite colored mana.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Infinite storm count[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Cloudstone Curio must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Abhorrent Overlord must be in your hand
  - Your devotion to black is at least five.
[END OF COMBO PREREQUISITES]
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