Arcbound Prototype + Ashnod's Altar Combos

2 known combos featuring both cards in Commander

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

Combo 1 with Eirdu, Carrier of Dawn // Isilu, Carrier of Twilight

Results: Infinite +1/+1 counters on certain creatures · Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite colorless mana
Steps
  1. Activate Ashnod's Altar 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.

Combo 2 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
Show steps
  1. Activate Antler Skulkin by paying {2}, giving Arcbound Prototype persist until end of turn.
  2. Activate Ashnod's Altar 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.
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