Fecundity + Phantom Train Combos

2 known combos featuring both cards in Commander

Infinite self-discard triggers Near-infinite ETB Infinite draw triggers Near-infinite LTB Near-infinite death triggers

Combo 1 with Olivia, Mobilized for War

Results: Infinite self-discard triggers · Near-infinite ETB · Infinite draw triggers · Infinite looting · Near-infinite LTB · Near-infinite death triggers · Near-infinite sacrifice triggers · Near-infinite +1/+1 counters on a creature
Steps
  1. Activate Phantom Train 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 Phantom Train 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 · Near-infinite +1/+1 counters on a creature
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 Phantom Train 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 Phantom Train abilities.
  5. Repeat.
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