Biomancer's Familiar + Chaos Spewer + Phyrexian Altar + Reaping Willow

Mana needed: {W/B}

WUBRG identity

Commander legal

The 4 combo pieces

How to execute it

  1. Activate Reaping Willow by paying {W/B} due to Biomancer's Familiar and removing two counters from it, returning Chaos Spewer from your graveyard to the battlefield.
  2. When Chaos Spewer enters, it triggers, putting two -1/-1 counters on Reaping Willow.
  3. Activate Phyrexian Altar by sacrificing Chaos Spewer, adding {W/B}.
  4. Repeat.

What the combo produces