Efficient Construction + Krark-Clan Ironworks Combos

3 known combos featuring both cards in Commander

Infinite colorless mana Infinite creature tokens Infinite death triggers Infinite ETB Infinite LTB

Combo 1 with Myr Retriever + Scrap Trawler

Results: Infinite colorless mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Steps
  1. Activate Krark-Clan Ironworks by sacrificing Scrap Trawler, adding {C}{C}.
  2. When Scrap Trawler dies, it triggers, returning Myr Retriever from your graveyard to your hand.
  3. Cast Myr Retriever by paying {2}.
  4. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
  5. Activate Krark-Clan Ironworks twice by sacrificing the Thopter and Myr Retriever, adding {C}{C}{C}{C}.
  6. When Myr Retriever dies, it triggers, returning Scrap Trawler from your graveyard to your hand.
  7. Cast Scrap Trawler by paying {3}.
  8. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
  9. Repeat.
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Combo 2 with Myr Retriever + Junk Diver

Results: Infinite colorless mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite storm count
Show steps
  1. Activate Krark-Clan Ironworks by sacrificing Junk Diver, adding {C}{C}.
  2. When Junk Diver dies, it triggers, returning Myr Retriever from your graveyard to your hand.
  3. Cast Myr Retriever by paying {2}.
  4. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
  5. Activate Krark-Clan Ironworks twice by sacrificing the Thopter and Myr Retriever, adding {C}{C}{C}{C}.
  6. When Myr Retriever dies, it triggers, returning Junk Diver from your graveyard to your hand.
  7. Cast Junk Diver by paying {3}.
  8. Efficient Construction triggers, creating a 1/1 Thopter artifact creature token.
  9. Repeat.

Combo 3 with Forensic Gadgeteer + Sensei's Divining Top

Results: Infinite card draw · Near-infinite ETB · Infinite draw triggers · Near-infinite storm count · Near-infinite LTB · Near-infinite death triggers · Near-infinite sacrifice triggers
Show steps
  1. Cast Sensei's Divining Top by paying {1}.
  2. Efficient Construction and Forensic Gadgeteer trigger, creating a 1/1 Thopter artifact creature token and a Clue token.
  3. Activate Krark-Clan Ironworks by sacrificing the Thopter, adding {C}{C}.
  4. Activate Sensei's Divining Top by tapping it, causing you to draw a card and put Sensei's Divining Top from the battlefield onto the top of your library.
  5. Activate the Clue by paying {1} and sacrificing it, causing you to draw Sensei's Divining Top.
  6. Repeat.
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