Canker Abomination + Mikaeus, the Unhallowed + Phyrexian Altar

BG identity

Commander legal

The 3 combo pieces

What must be in place

An opponent controls a creature.

How to execute it

  1. Activate Phyrexian Altar by sacrificing Canker Abomination, adding one mana of any color.
  2. When Canker Abomination dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  3. When Canker Abomination enters the battlefield, it triggers, putting a number of -1/-1 counters on it equal to the number of creatures an opponent controls.
  4. If the opponent had seven or more creatures, Canker Abomination will die as a state-based action due to having 0 or less toughness. If this occurs, repeat steps 2 through 4 infinitely.
  5. Otherwise, repeat from step 1.

What the combo produces