Heartstone + Phyrexian Altar Combos

3 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite +1/+1 counters on a creature

Combo 1 with Sliver Queen

Also requires: Sliver Queen Sliver Queen
Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Activate Sliver Queen by paying {1}, creating a 1/1 Sliver creature token.
  2. Activate Phyrexian Altar by sacrificing the Sliver token, adding {1}.
  3. Repeat.

Combo 2 with Twilight Drover

Also requires: Twilight Drover Twilight Drover
Results: Infinite +1/+1 counters on a creature · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Twilight Drover by paying {1}{W} and removing a +1/+1 counter from it, creating two 1/1 Spirit creature tokens.
  2. Activate Phyrexian Altar twice by sacrificing the Spirits, adding {1}{W}.
  3. When the Spirits die, Twilight Drover triggers twice, putting two +1/+1 counters on itself.
  4. Repeat.

Combo 3 with Luminous Broodmoth + Moonlit Lamenter

Results: Infinite card draw · Infinite draw triggers · Near-infinite ETB · Near-infinite LTB · Near-infinite death triggers · Near-infinite sacrifice triggers
Show steps
  1. Activate Phyrexian Altar by sacrificing Moonlit Lamenter, adding {W}.
  2. When Moonlit Lamenter dies, Luminous Broodmoth triggers, returning Moonlit Lamenter from your graveyard to the battlefield with a -1/-1 counter and a flying counter on it.
  3. Activate Moonlit Lamenter by paying {W} and removing the flying counter from it, causing you to draw a card.
  4. Repeat.
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