Necrotic Ooze + Endling + Phyrexian Altar + Fain, the Broker + Urabrask the Hidden

Necrotic Ooze
Endling
Phyrexian Altar
Fain, the Broker
Urabrask the Hidden

Requires
Necrotic Ooze must be on the battlefield. Endling must be in the graveyard. Phyrexian Altar must be on the battlefield. Fain, the Broker must be in the graveyard. Urabrask the Hidden must be on the battlefield. Mana needed:
Steps
  1. Activate Necrotic Ooze using Endling's third ability by paying , 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 .
  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.
  8. Activate Necrotic Ooze using Fain's fourth ability by paying 3, 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.
Results
Infinite +1/+1 counters. Infinite colored mana. Infinite creature tokens with haste. Infinite death triggers. Infinite ETB. Infinite LTB. Infinite sacrifice triggers. Infinite Treasure tokens.

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