Lab Rats + Phyrexian Altar + Rowan, Scion of War

Mana needed: {B}

BR identity

Commander legal

The 3 combo pieces

What must be in place

You have lost at least 4 life this turn.
Rowan does not have summoning sickness.

How to execute it

  1. Activate Rowan by tapping it, reducing the cost of all black and/or red spells you cast this turn by at least {4}.
  2. Cast Lab Rats with buyback by paying {B} due to Rowan's ability, creating a 1/1 Rat creature token and returning Lab Rats to your hand.
  3. Activate Phyrexian Altar by sacrificing the Rat, adding {B}.
  4. Repeat from step 2.

What the combo produces