How can you create a combo with Mechtitan Core, Prototype Portal, Myr Battlesphere, Dross Scorpion, Ashnod's Altar?
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[START OF COMBO]This combo can be formed with Mechtitan Core, Prototype Portal, Myr Battlesphere, Dross Scorpion, Ashnod's Altar

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 Ashnod's Altar by sacrificing the Mechtitan token, adding {C}{C}.
  4. The Mechtitan token dies, triggering Dross Scorpion and Mechtitan Core.
  5. Resolve the Dross Scorpion trigger, untapping Prototype Portal.
  6. Resolve the Mechtitan Core token trigger, returning all other cards exiled by it to the battlefield tapped.
  7. Myr Battlesphere enters the battlefield, creating four 1/1 Myr artifact creature tokens.
  8. Activate Ashnod's Altar three times by sacrificing three Myr tokens, adding {C}{C}{C}{C}{C}{C}.
  9. Dross Scorpion triggers three times, allowing you to untap up to three artifacts you control.
  10. 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
  - Dross Scorpion must be on the battlefield
  - Ashnod's Altar 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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