Fumulus, the Infestation + Yahenni, Undying Partisan Combos

2 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite storm count

Combo 1 with Chthonian Nightmare + Priest of Gix

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite storm count · Infinite black mana
Steps
  1. Activate Yahenni by sacrificing Priest of Gix.
  2. When Priest of Gix dies, Fumulus's first ability triggers, creating a 1/1 Insect creature token.
  3. Resolve the Yahenni ability.
  4. Activate Chthonian Nightmare by paying {E}{E}{E}, sacrificing the Insect and returning Chthonian Nightmare from the battlefield to your hand, returning Priest of Gix from your graveyard to the battlefield.
  5. When Priest of Gix enters the battlefield, it triggers, adding {B}{B}{B}.
  6. Cast Chthonian Nightmare by paying {1}{B}.
  7. When Chthonian Nightmare enters the battlefield, it triggers, causing you to get {E}{E}{E}.
  8. Repeat.

Combo 2 with Beifong's Bounty Hunters

Results: Infinite death triggers · Infinite landfall triggers · Infinite sacrifice triggers · Infinite ETB · Infinite LTB
Show steps
  1. Activate Yahenni by sacrificing another nonland creature.
  2. When the creature dies, Beifong's Bounty Hunters triggers, earthbending a land you control.
  3. Resolve the Yahenni ability.
  4. Activate Yahenni by sacrificing the earthbent land.
  5. When the land dies, Fumulus and Beifong's Bounty Hunters trigger.
  6. Resolve the Beifong's Bounty Hunters trigger, returning the land from your graveyard to the battlefield.
  7. Resolve the Fumulus trigger, creating a creature token.
  8. Resolve the Yahenni ability.
  9. Repeat.
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