How can you create a combo with Replication Specialist, Guardians of Koilos, Dross Scorpion, Dutiful Replicator, Ashnod's Altar?
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[START OF COMBO]This combo can be formed with Replication Specialist, Guardians of Koilos, Dross Scorpion, Dutiful Replicator, Ashnod's Altar

Color identity: U
Mana cost: {11}{U}
Steps:
  1. Cast Guardians of Koilos by paying {5}.
  2. When Guardians of Koilos enters the battlefield, it and Replication Specialist trigger.
  3. Resolve the Replication Specialist trigger, causing you to pay {1}{U} to create a token copy of Guardians of Koilos.
  4. When the token Guardians of Koilos enters the battlefield, it triggers.
  5. Resolve both Guardians of Koilos triggers, choosing to return nothing to your hand from the battlefield.
  6. Cast Dutiful Replicator by paying {3}.
  7. When Dutiful Replicator enters the battlefield, it and Replication Specialist trigger.
  8. Holding priority, activate a mana-producing artifact by tapping it, adding at least {U}.
  9. Resolve the Replication Specialist trigger, causing you to pay {1}{U} to create a token copy of Dutiful Replicator.
  10. When the token Dutiful Replicator enters the battlefield, it triggers, causing you to pay {1} to create a token copy of the Guardians of Koilos token.
  11. When the Guardians of Koilos token enters the battlefield, it triggers, choose to return nothing to your hand from the battlefield.
  12. Activate Ashnod's Altar by sacrificing the Dutiful Replicator token and the Guardians of Koilos token, adding {C}{C}{C}{C}.
  13. When the tokens die, Dross Scorpion triggers twice.
  14. Resolve the first trigger, untapping the mana-producing artifact.
  15. Activate the artifact by tapping it, adding at least {U}.
  16. Repeat steps 14 and 15 one additional time.
  17. Resolve the nontoken Dutiful Replicator trigger from step 7, causing you to pay {1} to create a token copy of Guardians of Koilos.
  18. When the Guardians of Koilos token enters the battlefield, it triggers, returning the nontoken Dutiful Replicator from the battlefield to your hand.
  19. Activate Ashnod's Altar by sacrificing the Guardians of Koilos token, adding {C}{C}.
  20. When the token dies, Dross Scorpion triggers, untapping the mana-producing artifact.
  21. Repeat from step 6.
  22. Once you have infinite blue and/or colorless mana, you may forego sacrificing the creature tokens.[END OF COMBO STEPS]

Result:
  - Infinite blue mana
  - Infinite colorless 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:
  - Replication Specialist must be on the battlefield
  - Guardians of Koilos must be in your hand
  - Dross Scorpion must be on the battlefield
  - Dutiful Replicator must be in your hand
  - Ashnod's Altar must be on the battlefield
  - You control a mana-producing artifact that can tap to produce at least {U}.
[END OF COMBO PREREQUISITES]
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