Phyrexian Altar + Runaway Steam-Kin + Undead Sprinter

Mana needed: {B/R}{B/R}{B/R}, minus {B/R} for each +1/+1 counter on Runaway Steam-Kin

BR identity

Commander legal

The 3 combo pieces

What must be in place

A non-Zombie creature has died this turn.

How to execute it

  1. Activate Phyrexian Altar by sacrificing Undead Sprinter, adding {B/R}.
  2. If Runaway Steam-Kin has three or more +1/+1 counters on it, activate it by removing three +1/+1 counters from it, adding {R}{R}{R}.
  3. Cast Undead Sprinter from your graveyard by paying {B}{R}.
  4. Runaway Steam-Kin triggers, putting a +1/+1 counter on it.
  5. Repeat from step 2.

What the combo produces