Endling + Mass Hysteria Combos

3 known combos featuring both cards in Commander

Infinite death triggers Infinite ETB Infinite LTB Infinite sacrifice triggers Infinite black mana

Combo 1 with Necrotic Ooze + Phyrexian Altar + Fain, the Broker

Also requires: Necrotic Ooze Necrotic Ooze Phyrexian Altar Phyrexian Altar Fain, the Broker Fain, the Broker
Results: Infinite colored mana · Infinite creature tokens with haste · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers · Infinite Treasure tokens · Infinite +1/+1 counters on creatures you control
Steps
  1. Activate Necrotic Ooze using Endling's third ability by paying {B}, giving Necrotic Ooze undying until end of turn.
  2. If Necrotic Ooze has any +1/+1 counters, activate it using Fain's second ability by tapping it and removing a +1/+1 counter from it, creating a Treasure token.
  3. Activate Phyrexian Altar by sacrificing Necrotic Ooze, adding {B}.
  4. Necrotic Ooze dies, triggering its undying ability, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  5. Repeat an arbitrarily large number of times.
  6. Activate Necrotic Ooze using Fain's third ability by tapping it and sacrificing a Treasure token, creating a 2/1 Inkling creature token.
  7. Activate four Treasure tokens by tapping and sacrificing them, adding {3}{B}.
  8. Activate Necrotic Ooze using Fain's fourth ability by paying {3}{B}, untapping it.
  9. Repeat from step 6.
  10. You may also use the infinite Inkling tokens to use Fain's first ability for infinite +1/+1 counters.

Combo 2 with Mairsil, the Pretender + Cauldron of Souls + Blood Vassal

Also requires: Mairsil, the Pretender Mairsil, the Pretender Cauldron of Souls Cauldron of Souls Blood Vassal Blood Vassal
Results: Infinite black mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
  2. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding {B}{B}.
  3. When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  4. Activate Mairsil using Endling's third ability by paying {B}, giving Mairsil undying until end of turn.
  5. Activate Mairsil using Blood Vassal's ability by sacrificing it, adding {B}{B}.
  6. When Mairsil dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Repeat.

Combo 3 with Mairsil, the Pretender + Cauldron of Souls + Blood Pet

Also requires: Mairsil, the Pretender Mairsil, the Pretender Cauldron of Souls Cauldron of Souls Blood Pet Blood Pet
Results: Infinite black mana · Infinite death triggers · Infinite ETB · Infinite LTB · Infinite sacrifice triggers
Show steps
  1. Activate Mairsil using Cauldron of Souls' ability by tapping it, giving itself persist until end of turn.
  2. Activate Mairsil using Blood Pet's ability by sacrificing it, adding {B}.
  3. When Mairsil dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
  4. Activate Mairsil using Endling's third ability by paying {B}, giving Mairsil undying until end of turn.
  5. Activate Mairsil using Blood Pet's ability by sacrificing it, adding {B}.
  6. When Mairsil dies, its undying ability triggers, returning it from your graveyard to the battlefield with a +1/+1 counter on it.
  7. Repeat.
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