How can you create a combo with Vat of Rebirth, Myr Battlesphere, Clock of Omens, Phyrexian Altar?
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[START OF COMBO]This combo can be formed with Vat of Rebirth, Myr Battlesphere, Clock of Omens, Phyrexian Altar

Color identity: B
Mana cost: {2}{B}
Steps:
  1. Activate Vat of Rebirth by paying {2}{B}, tapping it and removing four oil counters from it, returning Myr Battlesphere from your graveyard to the battlefield.
  2. Myr Battlesphere enters the battlefield, creating four 1/1 Myr artifact creature tokens.
  3. Activate Clock of Omens by tapping two Myrs, untapping Vat of Rebirth.
  4. Activate Phyrexian Altar four times by sacrificing Myr Battlesphere and three Myr tokens, adding {3}{B}.
  5. Myr Battlesphere and the Myrs die, triggering Vat of Rebirth four times, putting four oil counters on it.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colored mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana artifacts you control can produce
  - Infinite oil counters on Vat of Rebirth
  - Infinite sacrifice triggers
  - Infinite untap of artifacts you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Vat of Rebirth must be on the battlefield
  - Myr Battlesphere must be in the graveyard
  - Clock of Omens must be on the battlefield
  - Phyrexian Altar must be on the battlefield
  - Vat of Rebirth has at least four oil counters on it.
[END OF COMBO PREREQUISITES]
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