Cloudstone Curio + Underworld Hermit Combos

2 known combos featuring both cards in Commander

Infinite creature tokens Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers

Combo 1 with Phyrexian Altar

Also requires: Phyrexian Altar Phyrexian Altar
Results: Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
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.

Combo 2 with Ashnod the Uncaring + Akul the Unrepentant

Results: Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Akul the Unrepentant by sacrificing three creatures.
  2. Ashnod the Uncaring triggers, copying Akul the Unrepentant's ability.
  3. Resolve the copy of Akul the Unrepentant's ability, putting Underworld Hermit from your hand onto the battlefield.
  4. When Underworld Hermit enters the battlefield, it and Cloudstone Curio trigger.
  5. Resolve the Underworld Hermit trigger, creating a number of 1/1 Squirrel creature tokens equal to your devotion to black.
  6. When the Squirrels enter the battlefield, Cloudstone Curio triggers that many times, returning nothing to your hand from the battlefield.
  7. Resolve the Cloudstone Curio trigger from step 4, returning Akul the Unrepentant from the battlefield to your hand.
  8. Resolve Akul the Unrepentant's ability from step 1, putting it onto the battlefield from your hand.
  9. When Akul the Unrepentant enters the battlefield, Cloudstone Curio triggers, returning Underworld Hermit from the battlefield to your hand.
  10. Repeat.
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