Barrenton Medic + Cathars' Crusade + Nest of Scarabs

WB identity

Commander legal

The 3 combo pieces

What must be in place

Barrenton Medic does not have summoning sickness.
Barrenton Medic does not have more than two -1/-1 counters on it.

How to execute it

  1. Activate Barrenton Medic's first ability by tapping it, preventing the next one damage done to it this turn.
  2. Activate Barrenton Medic's second ability by putting a -1/-1 counter on it.
  3. Nest of Scarabs triggers, creating a 1/1 Insect creature token.
  4. The Insect enters the battlefield, triggering Cathars' Crusade, putting a +1/+1 counter on each creature you control.
  5. Resolve the Barrenton Medic ability from step 2, untapping it.
  6. Repeat.

What the combo produces