Arcbound Prototype + Krark-Clan Ironworks Combos

2 known combos featuring both cards in Commander

Infinite +1/+1 counters on certain creatures Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers

Combo 1 with Antler Skulkin

Also requires: Antler Skulkin Antler Skulkin
Results: Infinite +1/+1 counters on certain creatures · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Activate Antler Skulkin by paying {2}, giving Arcbound Prototype persist until end of turn.
  2. Activate Krark-Clan Ironworks by sacrificing Arcbound Prototype, adding {C}{C}.
  3. When Arcbound Prototype dies, its modular and persist abilities trigger.
  4. Resolve the modular trigger, putting all +1/+1 counters on Arcbound Prototype onto another artifact creature you control.
  5. Resolve the persist trigger, returning Arcbound Prototype from your graveyard to the battlefield with one +1/+1 counter on it due to its modular ability.
  6. Repeat.

Combo 2 with Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite colorless mana · Infinite +1/+1 counters on certain creatures
Show steps
  1. Activate Krark-Clan Ironworks by sacrificing Arcbound Prototype.
  2. When Arcbound Prototype dies, its modular ability and persist ability trigger.
  3. Resolve the modular trigger, putting Arcbound Prototype's +1/+1 counters on another artifact creature.
  4. Resolve the persist trigger, returning Arcbound Prototype from your graveyard to the battlefield. It will not have a -1/-1 counter on it due to its modular ability.
  5. Repeat.
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