Kilo, Apogee Mind + Agatha's Soul Cauldron + Barrenton Medic

Kilo, Apogee Mind

Agatha's Soul Cauldron

Barrenton Medic

How it works

1. Activate Kilo using Barrenton Medic's first ability by tapping it.
2. Kilo triggers, causing you to proliferate and put a +1/+1 counter on Kilo.
3. Resolve the Kilo ability from step 1.
4. Activate Kilo using Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it.
5. Repeat.