Gravelgill Axeshark + Thran Vigil + Yahenni, Undying Partisan

UB identity

Commander legal

The 3 combo pieces

How to execute it

  1. Activate Yahenni 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 Yahenni ability.
  5. Repeat.

What the combo produces