How can you create a combo with Miirym, Sentinel Wyrm, Cloudstone Curio, Mothdust Changeling, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Miirym, Sentinel Wyrm, Cloudstone Curio, Mothdust Changeling, Phyrexian Altar

Color identity: GUR
Mana cost: {U}
Steps:
  1. Cast Mothdust Changeling by paying {U}.
  2. Mothdust Changeling enters the battlefield, triggering Cloudstone Curio and Miirym.
  3. Resolve the Cloudstone Curio trigger, choosing not to return anything to your hand from the battlefield.
  4. Resolve the Miirym trigger, creating a token copy of Mothdust Changeling.
  5. The Mothdust Changeling token enters the battlefield, triggering Cloudstone Curio, returning the nontoken Mothdust Changeling from the battlefield to your hand.
  6. Activate Phyrexian Altar by sacrificing the Mothdust Changeling token, adding {U}.
  7. Repeat.[END OF COMBO STEPS]

Result:
  - 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:
  - Miirym, Sentinel Wyrm must be on the battlefield
  - Cloudstone Curio must be on the battlefield
  - Mothdust Changeling must be in your hand
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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