Phyrexian Altar + Scarecrone Combos

4 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite colored mana

Combo 1 with Thornbite Staff + Myr Battlesphere

Results: Infinite colored mana · Infinite creature tokens · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Steps
  1. Activate Phyrexian Altar by sacrificing Myr Battlesphere, adding {1}.
  2. Myr Battlesphere dies, triggering Scarecrone, untapping Scarecrone.
  3. Activate Scarecrone's second ability by paying {4} and tapping it, returning Myr Battlesphere from your graveyard to the battlefield.
  4. Myr Battlesphere enters the battlefield, creating four 1/1 Myr creature tokens.
  5. Activate Phyrexian Altar three times by sacrificing three Myr tokens, adding {3}.
  6. Repeat.

Combo 2 with Thornbite Staff + Cathodion

Results: Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Phyrexian Altar by sacrificing Cathodion, adding {1}.
  2. Cathodion dies, triggering itself and Scarecrone.
  3. Resolve the Cathodion trigger, adding {C}{C}{C}.
  4. Resolve the Scarecrone trigger, untapping it.
  5. Activate Scarecrone's second ability by paying {4} and tapping it, returning Cathodion from your graveyard to the battlefield.
  6. Repeat.

Combo 3 with Su-Chi Cave Guard + Voltaic Construct

Results: Infinite colored mana · Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite untap of artifact creatures you control
Show steps
  1. Activate Phyrexian Altar by sacrificing Su-Chi Cave Guard, adding one mana of any color.
  2. When Su-Chi Cave Guard dies, it triggers, adding eight {C}.
  3. Activate Scarecrone's second ability by paying {4} and tapping it, returning Su-Chi Cave Guard to the battlefield from your graveyard.
  4. Activate Voltaic Construct by paying {2}, untapping Scarecrone.
  5. Repeat.

Combo 4 with Thornbite Staff + Su-Chi

Results: Infinite colored mana · Infinite colorless mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Phyrexian Altar by sacrificing Su-Chi, adding one mana of any color.
  2. Su-Chi dies, triggering itself and Scarecrone.
  3. Resolve the Su-Chi trigger, adding {C}{C}{C}{C}.
  4. Resolve the Scarecrone trigger, untapping it.
  5. Activate Scarecrone's second ability by paying {4} and tapping it, returning Su-Chi from your graveyard to the battlefield.
  6. Repeat.
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