Cauldron of Souls + Yahenni, Undying Partisan Combos

7 known combos featuring both cards in Commander

Infinite LTB Infinite ETB Infinite sacrifice triggers Infinite death triggers Infinite +1/+1 counters on legendary creatures you control

Combo 1 with Dross Scorpion + Encroaching Mycosynth

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers
Steps
  1. Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
  2. Activate Yahenni by sacrificing the creature with bloodthirst.
  3. When the creature dies, its persist ability and Dross Scorpion trigger.
  4. Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
  5. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
  6. Resolve the Yahenni ability.
  7. Repeat.

Combo 2 with Dross Scorpion + Mycosynth Lattice

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers
Show steps
  1. Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
  2. Activate Yahenni by sacrificing the creature with bloodthirst.
  3. When the creature dies, its persist ability and Dross Scorpion trigger.
  4. Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
  5. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
  6. Resolve the Yahenni ability.
  7. Repeat.

Combo 3 with Dross Scorpion + Biotransference

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers
Show steps
  1. Activate Cauldron of Souls by tapping it, giving the creature with bloodthirst persist until end of turn.
  2. Activate Yahenni by sacrificing the creature with bloodthirst.
  3. When the creature dies, its persist ability and Dross Scorpion trigger.
  4. Resolve the persist trigger, returning the creature from your graveyard to the battlefield, which enters the battlefield with at least one +1/+1 counter on it due to its bloodthirst ability.
  5. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
  6. Resolve the Yahenni ability.
  7. Repeat.

Combo 4 with Szarel, Genesis Shepherd + Clock of Omens

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers
Show steps
  1. Activate Cauldron of Souls by tapping it, giving two nontoken artifact creatures persist until end of turn.
  2. Activate Clock of Omens by tapping the nontoken artifact creatures, untapping Cauldron of Souls.
  3. Activate Yahenni by sacrificing one of the nontoken artifact creatures that doesn't have a -1/-1 counter on it.
  4. When the creature dies, its persist ability and Szarel triggers.
  5. Resolve the persist trigger, returning the creature from your graveyard to the battlefield.
  6. Resolve the Szarel trigger, putting a number of +1/+1 counters on the other artifact creature.
  7. Resolve the Yahenni ability.
  8. Repeat from step 3 once, instead sacrificing the creature who had counters placed on it in step 6.
  9. Repeat from step 1.

Combo 5 with Dross Scorpion + Arsenal Thresher

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers
Show steps
  1. Activate Cauldron of Souls by tapping it, giving Arsenal Thresher persist until end of turn.
  2. Activate Yahenni by sacrificing Arsenal Thresher.
  3. When Arsenal Thresher dies, its persist ability and Dross Scorpion trigger.
  4. Resolve the Dross Scorpion trigger, untapping Cauldron of Souls.
  5. Resolve the Arsenal Thresher trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it, and then choosing to reveal at least one artifact card from your hand to remove the -1/-1 counter.
  6. Resolve the Yahenni ability.
  7. Repeat.

Combo 6 with Gerrard, Weatherlight Hero + Extruder

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers
Show steps
  1. Activate Cauldron of Souls by tapping it, giving Gerrard persist until end of turn.
  2. Activate Extruder by sacrificing Cauldron of Souls, putting a +1/+1 counter on Gerrard.
  3. Activate Yahenni by sacrificing Gerrard.
  4. When Gerrard dies, it and its persist ability trigger.
  5. Resolve the Gerrard persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  6. Resolve the second Gerrard trigger, failing to exile it as it has left your graveyard, and returning Cauldron of Souls from your graveyard to the battlefield.
  7. Resolve the Yahenni ability from step 3.
  8. Repeat.

Combo 7 with Derevi, Empyrial Tactician + Aerith Gainsborough

Results: Infinite LTB · Infinite ETB · Infinite sacrifice triggers · Infinite death triggers · Infinite +1/+1 counters on legendary creatures you control
Show steps
  1. Activate Cauldron of Souls by tapping it, giving Derevi and Aerith persist until end of turn.
  2. Activate Yahenni by sacrificing Derevi.
  3. When Derevi dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  4. When Derevi enters the battlefield, it triggers, untapping Cauldron of Souls.
  5. Activate Yahenni by sacrificing Aerith.
  6. When Aerith dies, it triggers twice.
  7. Resolve Aerith's persist trigger, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  8. Resolve the second Aerith trigger, putting a +1/+1 counter on each legendary creature you control, thus removing the -1/-1 counters from Aerith and Derevi.
  9. Resolve the Yahenni abilities from steps 2 and 5.
  10. Repeat.
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