Mighty Mutanimals + Barrenton Medic + Nest of Scarabs

Mighty Mutanimals

Barrenton Medic

Nest of Scarabs

How it works

1. Activate Barrenton Medic's first ability by tapping it.
2. Activate Barrenton Medic's second ability by putting a -1/-1 counter on it.
3. Nest of Scarabs triggers, creating a creature token.
4. When the creature token enters, Mighty Mutanimals triggers, putting a +1/+1 counter on Barrenton Medic.
5. Resolve the Barrenton Medic ability from step 2, untapping it.
6. Repeat.