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

Color identity: B
Mana cost: {4}{B}{B}
Steps:
  1. Cast Underworld Hermit by paying {4}{B}{B}.
  2. When Underworld Hermit 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 Underworld Hermit trigger, creating a number of 1/1 Squirrel creature tokens equal to your devotion to black.
  5. When the Squirrels enter the battlefield, Cloudstone Curio triggers that many times.
  6. Resolve the first Cloudstone Curio trigger, returning Underworld Hermit 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 six times by sacrificing six Squirrels, adding {4}{B}{B}.
  9. Repeat.
  10. If your devotion to black excluding Underworld Hermit is at least five, 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
  - Underworld Hermit must be in your hand
  - Your devotion to black is at least four.
[END OF COMBO PREREQUISITES]
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