Colfenor, the Last Yew + Gutter Grime + Yahenni, Undying Partisan

WBG identity

Commander legal

The 3 combo pieces

How to execute it

  1. Cast the creature card in your hand by paying {0}.
  2. Either that creature dies as a state-based action due to having zero toughness, or activate Yahenni by sacrificing that creature.
  3. Gutter Grime triggers, putting a slime counter on it and creating a X/X Ooze creature token.
  4. Activate Yahenni by sacrificing the Ooze.
  5. When the Ooze dies, Colfenor triggers, returning the creature card from your graveyard to your hand.
  6. Resolve the Yahenni abilities, giving Yahenni indestructible until end of turn.
  7. Repeat.

What the combo produces