Gravelgill Axeshark + Thran Vigil + Umbral Collar Zealot

UB identity

Commander legal

The 3 combo pieces

How to execute it

  1. Activate Umbral Collar Zealot by sacrificing Gravelgill Axeshark.
  2. When Gravelgill Axeshark dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  3. Thran Vigil triggers, putting a +1/+1 counter on Gravelgill Axeshark.
  4. Resolve the Umbral Collar Zealot ability.
  5. Repeat.

What the combo produces