Extruder + Phyrexian Altar Combos

2 known combos featuring both cards in Commander

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

Combo 1 with Sword of the Meek + Animation Module

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite +1/+1 counters on creatures you control
Steps
  1. Activate Extruder by sacrificing Sword of the Meek, putting a +1/+1 counter on it.
  2. Animation Module triggers, causing you to pay {1} to create a 1/1 Servo artifact creature token.
  3. When the Servo enters, Sword of the Meek triggers, returning itself from your graveyard to the battlefield attached to the Servo.
  4. Activate Phyrexian Altar by sacrificing the Servo, adding {1}.
  5. Repeat.

Combo 2 with Gerrard, Weatherlight Hero + Cauldron of Souls

Results: Infinite LTB · Infinite ETB · Infinite colored mana · Infinite sacrifice triggers · Infinite death triggers
Show steps
  1. Activate Cauldron of Souls by tapping it, giving Gerrard persist until end of turn.
  2. Activate Extruder by sacrificing Cauldron of Souls, putting a +1/+1 counter on Gerrard.
  3. Activate Phyrexian Altar by sacrificing Gerrard, adding one mana of any color.
  4. When Gerrard dies, it and its persist ability trigger.
  5. Resolve the Gerrard persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  6. Resolve the second Gerrard trigger, failing to exile it as it has left your graveyard, and returning Cauldron of Souls from your graveyard to the battlefield.
  7. Repeat.
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