Mass Hysteria + Necrotic Ooze Combos

1 known combo featuring both cards in Commander

Infinite colored mana Infinite creature tokens with haste Infinite death triggers Infinite ETB Infinite LTB

Combo 1 with Endling + Phyrexian Altar + Fain, the Broker

Also requires: Endling Endling 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.
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