How can you create a combo with Mechtitan Core, Prototype Portal, Myr Battlesphere, Clock of Omens, Krark-Clan Ironworks?
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[START OF COMBO]This combo can be formed with Mechtitan Core, Prototype Portal, Myr Battlesphere, Clock of Omens, Krark-Clan Ironworks

Color identity: C
Mana cost: {7}
Steps:
  1. Activate Prototype Portal by paying {2} and tapping it, creating a token copy of Mechtitan Core.
  2. Activate the Mechtitan Core token by paying {5} and exiling it, Myr Battlesphere, and any three other nontoken artifact creatures and/or nontoken Vehicles, creating a 10/10 Mechtitan creature token.
  3. Activate Krark-Clan Ironworks by sacrificing the Mechtitan token, adding {C}{C}.
  4. The Mechtitan core token triggers, returning all other cards exiled by it to the battlefield tapped.
  5. Myr Battlesphere enters the battlefield, creating four 1/1 Myr artifact creature tokens.
  6. Activate Clock of Omens by tapping two Myr tokens, untapping Prototype Portal.
  7. Activate Krark-Clan Ironworks three times by sacrificing three Myr tokens, adding {C}{C}{C}{C}{C}{C}.
  8. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite blinking of nontoken artifact creatures you control
  - Infinite blinking of nontoken Vehicles you control
  - Infinite colorless mana
  - Infinite creature tokens
  - Infinite death triggers
  - Infinite enters the battlefield
  - Infinite leaves the battlefield
  - Infinite mana artifacts you control can produce
  - Infinite sacrifice triggers
  - Infinite untap of artifacts you control[END OF COMBO RESULT][END OF COMBO]

Other prerequisites:
  - Mechtitan Core must be exiled
  - Prototype Portal must be on the battlefield
  - Myr Battlesphere must be on the battlefield
  - Clock of Omens must be on the battlefield
  - Krark-Clan Ironworks must be on the battlefield
  - You control at least three other nontoken artifact creatures and/or nontoken Vehicles.
[END OF COMBO PREREQUISITES]
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