How can you create a combo with Miirym, Sentinel Wyrm, Bladewing the Risen, Ashnod's Altar?
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[START OF COMBO]This combo can be formed with Miirym, Sentinel Wyrm, Bladewing the Risen, Ashnod's Altar

Color identity: UBRG
Mana cost: {3}{B}{B}{R}{R}
Steps:
  1. Cast Bladewing by paying {3}{B}{B}{R}{R}.
  2. When Bladewing enters the battlefield, it and Miirym trigger.
  3. Resolve the Bladewing trigger, returning any Dragon from your graveyard to the battlefield.
  4. Activate Ashnod's Altar by sacrificing Bladewing, adding {C}{C}.
  5. Resolve the Miirym trigger, creating a nonlegendary token copy of Bladewing.
  6. When the Bladewing token enters the battlefield, it triggers, returning Bladewing from your graveyard to the battlefield.
  7. Repeat from step 2.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite sacrifice triggers
  - Return all Dragons from your graveyard to the battlefield[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Miirym, Sentinel Wyrm must be on the battlefield
  - Bladewing the Risen must be in your hand
  - Ashnod's Altar must be on the battlefield
[END OF COMBO PREREQUISITES]
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