Bioengineered Future + Krark-Clan Ironworks Combos

2 known combos featuring both cards in Commander

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

Combo 1 with Metalwork Colossus + The Ooze

Results: Infinite +1/+1 counters on creatures you control · Infinite ETB · Infinite LTB · Infinite Mutagen tokens · Infinite colorless mana · Infinite death triggers · Infinite sacrifice triggers · Infinite storm count
Steps
  1. Cast Metalwork Colossus by paying {0}, which enters with at least two +1/+1 counters on it due to Bioengineered Future.
  2. Activate Krark-Clan Ironworks by sacrificing Metalwork Colossus.
  3. When Metalwork Colossus dies, The Ooze triggers, creating a Mutagen token for each +1/+1 counter Metalwork Colossus had.
  4. Activate Metalwork Colossus by sacrificing two Mutagens, returning it from your graveyard to your hand.
  5. Repeat.

Combo 2 with Mister Gutsy + Nim Deathmantle

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite colorless mana · Exile your library with the ability to play the exiled cards until end of turn · Infinite Junk tokens
Show steps
  1. Activate Krark-Clan Ironworks by sacrificing Mister Gutsy, adding {C}{C}.
  2. When Mister Gutsy dies, its second ability and Nim Deathmantle trigger.
  3. Resolve the Mister Gutsy trigger, creating a number of Junk tokens equal to the number of +1/+1 counters that were on it.
  4. If you created a Junk token, activate Krark-Clan Ironworks by sacrificing a Junk, adding {C}{C}.
  5. Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Mister Gutsy from your graveyard to the battlefield with a +1/+1 counter on it, and attaching Nim Deathmantle to it.
  6. Repeat.
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