Blood Vassal + Endling + Mairsil, the Pretender + Walking Ballista

Mana needed: {B}

UBR identity

Commander legal

The 4 combo pieces

How to execute it

  1. Activate Mairsil using Endling's third ability by paying {B}, gaining Mairsil undying.
  2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding {B}{B}.
  3. Mairsil undying triggers, returning it to the battlefield with a +1/+1 counter.
  4. Activate Mairsil using Walking Ballista's last ability by removing a +1/+1 counter, dealing 1 damage to any target.
  5. Repeat.

What the combo produces