Lab Rats + Phyrexian Altar + Witherbloom, the Balancer

Mana needed: {B}

BG identity

Commander legal

The 3 combo pieces

How to execute it

  1. Cast Lab Rats with buyback by paying {B} due to its affinity for creatures, creating a creature token and returning Lab Rats to your hand.
  2. Activate Phyrexian Altar by sacrificing the creature token, adding {B}.
  3. Repeat.

What the combo produces