Ashnod's Altar + Scion of the Swarm Combos

3 known combos featuring both cards in Commander

Infinite +1/+1 counters on a creature Infinite colorless mana Infinite death triggers Infinite ETB Infinite lifegain

Combo 1 with Animation Module + Dross Harvester

Results: Infinite +1/+1 counters on a creature · Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite lifegain · Infinite lifegain triggers · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Activate Ashnod's Altar by sacrificing another creature, adding {C}{C}.
  2. When the creature dies, Dross Harverster's second ability triggers, causing you to gain 2 life.
  3. Scion of the Swarm triggers, putting a +1/+1 counter on itself.
  4. Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
  5. Repeat.

Combo 2 with Animation Module + Soul's Attendant

Results: Infinite +1/+1 counters on a creature · Infinite colorless mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite lifegain · Infinite lifegain triggers · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Cause a creature to enter the battlefield under your control.
  2. Soul's Attendant triggers, causing you to gain 1 life.
  3. Scion of the Swarm triggers, putting a +1/+1 counter on itself.
  4. Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
  5. When the Servo enters the battlefield, Soul's Attendant triggers.
  6. Holding priority, activate Ashnod's Altar by sacrificing the Servo, adding {C}{C}.
  7. Resolve the Soul's Attendant trigger, causing you to gain 1 life.
  8. Repeat from step 3.

Combo 3 with Animation Module + Soul Warden

Results: Infinite +1/+1 counters on a creature · Infinite colorless mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite lifegain · Infinite lifegain triggers · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Cause a creature to enter the battlefield under your control.
  2. Soul Warden triggers, causing you to gain 1 life.
  3. Scion of the Swarm triggers, putting a +1/+1 counter on itself.
  4. Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
  5. When the Servo enters the battlefield, Soul Warden triggers.
  6. Holding priority, activate Ashnod's Altar by sacrificing the Servo, adding {C}{C}.
  7. Resolve the Soul Warden trigger, causing you to gain 1 life.
  8. Repeat from step 3.
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