How can you create a combo with Recurring Nightmare, Phyrexian Altar, Myr Battlesphere?
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[START OF COMBO]This combo can be formed with Recurring Nightmare, Phyrexian Altar, Myr Battlesphere

Color identity: B
Mana cost: 
Steps:
  1. Activate Recurring Nightmare by sacrificing a creature and returning it from the battlefield to your hand, returning Myr Battlesphere from your graveyard to the battlefield.
  2. When Myr Battlesphere enters the battlefield, it triggers, creating four 1/1 Myr artifact creature tokens.
  3. Activate Phyrexian Altar three times by sacrificing Myr Battlesphere and two Myrs, adding {2}{B}.
  4. Cast Recurring Nightmare by paying {2}{B}.
  5. Repeat.[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:
  - Recurring Nightmare must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Myr Battlesphere must be in the graveyard
  - You control at least one creature.
[END OF COMBO PREREQUISITES]
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