Necrotic Ooze + Barrenton Medic + Morselhoarder

Necrotic Ooze

Barrenton Medic

Morselhoarder

How it works

1. Activate Necrotic Ooze using Barrenton Medic's second ability by putting a -1/-1 counter on it, untapping it.
2. Activate Necrotic Ooze using Morselhoarder's ability by removing a -1/-1 counter from it, adding one mana of any color.
3. Repeat.