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

Prerequisites

• Kilo, Apogee Mind on the battlefield
• Agatha's Soul Cauldron on the battlefield
• Barrenton Medic in exile

Steps

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

Results

• Infinite proliferate