Blood Vassal + Endling + Mairsil, the Pretender + Spike Feeder

Mana needed: {B}

UBRG identity

Commander legal

The 4 combo pieces

What must be in place

Mairsil does not have a +1/+1 counter on it.

How to execute it

  1. Activate Mairsil using Endling's third ability by paying {B}, giving Mairsil undying until end of turn.
  2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding {B}{B}.
  3. Mairsil dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  4. Activate Mairsil using Spike Feeder's second ability by removing a +1/+1 counter from it, causing you to gain 2 life.
  5. Repeat.

What the combo produces