Donatello, the Brains + Phyrexian Altar Combos

2 known combos featuring both cards in Commander

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

Combo 1 with Scurry Oak

Also requires: Scurry Oak Scurry Oak
Results: Infinite +1/+1 counters on a creature · Infinite ETB · Infinite LTB · Infinite death triggers · Infinite sacrifice triggers
Steps
  1. Put a +1/+1 counter on Scurry Oak.
  2. Scurry Oak triggers, creating a creature token and a Mutagen token due to Donatello.
  3. Activate Phyrexian Altar by sacrificing the creature token, adding {1}.
  4. Activate the Mutagen by paying {1}, tapping and sacrificing it, putting a +1/+1 counter on Scurry Oak.
  5. Repeat from step 2.

Combo 2 with Herd Baloth

Also requires: Herd Baloth Herd Baloth
Results: Infinite +1/+1 counters on a creature · Infinite ETB · Infinite LTB · Infinite death triggers · Infinite sacrifice triggers
Show steps
  1. Put a +1/+1 counter on Herd Baloth.
  2. Herd Baloth triggers, creating a creature token and a Mutagen token due to Donatello.
  3. Activate Phyrexian Altar by sacrificing the creature token, adding {1}.
  4. Activate the Mutagen by paying {1}, tapping and sacrificing it, putting a +1/+1 counter on Herd Baloth.
  5. Repeat from step 2.
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