Fecundity + Yahenni, Undying Partisan Combos

2 known combos featuring both cards in Commander

Near-infinite ETB Infinite draw triggers Near-infinite LTB Near-infinite death triggers Near-infinite sacrifice triggers

Combo 1 with Olivia, Mobilized for War

Results: Near-infinite ETB · Infinite draw triggers · Infinite looting · Near-infinite LTB · Near-infinite death triggers · Near-infinite sacrifice triggers · Infinite self-discard triggers
Steps
  1. Activate Yahenni by sacrificing the persist creature.
  2. When the persist creature dies, it and Fecundity trigger.
  3. Resolve the Fecundity trigger, causing you to draw a card.
  4. Resolve the persist creature's trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  5. When the persist creature enters the battlefield, Olivia triggers, putting a +1/+1 counter on the persist creature and causing you to discard a card.
  6. Resolve the Yahenni ability.
  7. Repeat.

Combo 2 with Zombie Infestation + Queen Allenal of Ruadach

Results: Infinite self-discard triggers · Near-infinite ETB · Infinite draw triggers · Near-infinite LTB · Infinite rummaging · Near-infinite death triggers · Near-infinite sacrifice triggers
Show steps
  1. Activate Zombie Infestation by discarding two cards, creating a 2/2 Zombie creature token and a 1/1 Soldier creature token.
  2. Activate Yahenni twice by sacrificing the Zombie and Soldier.
  3. When the Zombie and Soldier die, Fecundity triggers twice, causing you to draw two cards.
  4. Resolve both Yahenni abilities.
  5. Repeat.
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