Phyrexian Altar + Pith Driller Combos

3 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite power for certain creatures until end of turn

Combo 1 with Mikaeus, the Unhallowed

Results: Infinite colored mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Activate Phyrexian Altar by sacrifiicing Pith Driller, adding one mana of any color.
  2. When Pith Driller dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. When Pith Driller enters the battlefield, it triggers, putting a -1/-1 counter on it.
  4. Repeat.

Combo 2 with Zellix, Sanity Flayer + Haunted One + Intruder Alarm

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite power for certain creatures until end of turn · Infinite mana creatures you control can produce · Infinite mill · Infinite sacrifice triggers · Infinite self-mill · Infinite untap of creatures · Near-infinite colored mana · Near-infinite creature tokens · Infinite untap of creatures you control
Show steps
  1. Activate Zellix by paying {1} and tapping it.
  2. Haunted One triggers, causing all Horrors you control to get +2/+0 and undying until end of turn.
  3. Resolve the Zellix ability, causing a player to mill three cards.
  4. If the player milled a creature card this way, Zellix triggers, creating a 1/1 Horror creature token.
  5. Activate Phyrexian Altar by sacrificing Pith Driller, adding {1}.
  6. When Pith Driller dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. When Pith Driller enters the battlefield, it and Intruder Alarm trigger.
  8. Resolve the Pith Driller trigger, putting a -1/-1 counter on it.
  9. Resolve the Intruder Alarm trigger, untapping all creatures.
  10. Repeat.

Combo 3 with Zellix, Sanity Flayer + Haunted One + Faces of the Past

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite power for certain creatures until end of turn · Infinite mill · Infinite sacrifice triggers · Infinite self-mill · Infinite untap of all Horrors · Near-infinite colored mana · Near-infinite creature tokens
Show steps
  1. Activate Zellix by paying {1} and tapping it.
  2. Haunted One triggers, causing all Horrors you control to get +2/+0 and undying until end of turn.
  3. Resolve the Zellix ability, causing a player to mill three cards.
  4. If the player milled a creature card this way, Zellix triggers, creating a 1/1 Horror creature token.
  5. Activate Phyrexian Altar by sacrificing Pith Driller, adding {1}.
  6. When Pith Driller dies, its undying ability and Faces of the Past trigger.
  7. Resolve the Pith Driller trigger, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  8. When Pith Driller enters the battlefield, it triggers, putting a -1/-1 counter on it.
  9. Resolve the Faces of the Past trigger, untapping all Horrors.
  10. Repeat.
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