How can you create a combo with Metalwork Colossus, Genesis Chamber, Mirrodin Besieged, Krark-Clan Ironworks?
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[START OF COMBO]This combo can be formed with Metalwork Colossus, Genesis Chamber, Mirrodin Besieged, Krark-Clan Ironworks

Color identity: U
Mana cost: {1} (at most)
Steps:
  1. Cast Metalwork Colossus by paying at most {1}.
  2. Mirrodin Besieged triggers, creating a 1/1 Myr artifact creature token.
  3. When Metalwork Colossus enters the battlefield, Genesis Chamber triggers, creating a 1/1 Myr artifact creature token.
  4. Activate Krark-Clan Ironworks by sacrificing Metalwork Colossus, adding {C}{C}.
  5. Activate Metalwork Colossus by sacrificing the two Myrs, returning it from your graveyard to your hand.
  6. Repeat.[END OF COMBO STEPS]

Result:
  - Infinite colorless mana
  - 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:
  - Metalwork Colossus must be in your hand
  - Genesis Chamber must be on the battlefield
  - Mirrodin Besieged must be on the battlefield
  - Krark-Clan Ironworks must be on the battlefield
  - You conrol noncreature artifacts with a total mana value of 10 or greater.
  - "Mirran" chosen with Mirrodin Besieged.
[END OF COMBO PREREQUISITES]
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