Metalwork Colossus + Mirrodin Besieged Combos

2 known combos featuring both cards in Commander

Infinite colorless mana Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers

Combo 1 with Pitiless Plunderer + Krark-Clan Ironworks

Results: Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Steps
  1. Cast Metalwork Colossus by paying at most {1}.
  2. Mirrodin Besieged triggers, creating a 1/1 Myr artifact creature token.
  3. Activate Krark-Clan Ironworks by sacrificing Metalwork Colossus, adding {C}{C}.
  4. When Metalwork Colossus dies, Pitiless Plunderer triggers, creating a Treasure token.
  5. Activate Metalwork Colossus by sacrificing the Treasure and Myr, returning it from your graveyard to your hand.
  6. Repeat.

Combo 2 with Genesis Chamber + Krark-Clan Ironworks

Results: Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Show 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.
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