How can you create a combo with Bladewing's Thrall, Cloudstone Curio, Slumbering Dragon, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Bladewing's Thrall, Cloudstone Curio, Slumbering Dragon, Phyrexian Altar

Color identity: BR
Mana cost: {R}
Steps:
  1. Cast Slumbering Dragon by paying {R}.
  2. When Slumbering Dragon enters the battlefield, Cloudstone Curio and Bladewing's Thrall trigger.
  3. Resolve the Cloudstone Curio trigger, choosing to return nothing to your hand.
  4. Resolve the Bladewing's Thrall trigger, returning it from your graveyard to the battlefield.
  5. When Bladewing's Thrall enters the battlefield, Cloudstone Curio triggers, returning Slumbering Dragon from the battlefield to your hand.
  6. Activate Phyrexian Altar by sacrificing Bladewing's Thrall, adding {R}.
  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:
  - Bladewing's Thrall must be in the graveyard
  - Cloudstone Curio must be on the battlefield
  - Slumbering Dragon must be in your hand
  - Phyrexian Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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