Blood Pet + Crystalline Crawler + Endling + Mairsil, the Pretender

Mana needed: {B}

UBR 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 Pet's ability by sacrificing it, adding {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 Crystalline Crawler's first ability by removing a +1/+1 counter from it, adding one mana of any color.
  5. Repeat.

What the combo produces